Qu-Ax has released some new unis under there qx label frames are round topped not square like mine very light but not cheap so far 19"-29" .
They looks nice my main concern is that you now have a complete non standard spec uni. The seat post diameter is now 31.6mm, so if you break a seat post somewhere and they have no quax in stock that is a hassle.
The seat clamp is also not unicycle standard however is a bike standard so they do exist in non UDC shops.
The quaxle gives you the option of 2 cranks only. If you break your quaxle hub you need to replace it with another quaxle if you want to use your cranks again.
They look fantastic… My only concern, as already mentioned, is the incompatibility with other unicycles Brands parts/cranks (I already have many spare parts) … otherwise I would be very tempted to get one myself : they look like they are very good quality unicycles and the Q-axle system seems to be a good idea according to their article in the Qu-ax page https://www.qu-ax.de/en/2016/why-changing-to-q-axle/
They only have two multi hole cranks but have several single hole cranks UDC uk stocks hubs cranks ect and always avail from Germany I did not notice the seat post size unusual.
The axle interface looks similar to the Profile hub & cranks on my old Wilder Muni. Creak-creak-creak! I don’t know if Profile was a tapered interface or not, but mine always creaked. I couldn’t sneak up on anybody except on level ground! 
But the Quaxle setup looks really nice. We shouldn’t expect the whole unicycle industry to settle on single standards for crucial parts like axles/hubs. Pedals, maybe, but that’s a good thing because nobody makes pedals specifically for unicycles! While I had my Wilder, I knew my crankset could only use Profile parts, and I did put on shorter cranks twice (170, then 160 then 145). And none of those ever broke.
I agree with John. Non-standard cranks aren’t a huge issue as long as there are lots of options offered!
The seatpost thing is a bit annoying though. UDC doesn’t stock any in that size, so if you break one you’re basically stuck with getting one from a specific Qu-Ax dealer. But at the same time, you’re pretty much stuck buying any uni seatpost from a specific unicycle dealer unless you use a bike rail saddle I guess 
The longest advertised Q-axle cranks are 145mm. WTF? The QU-AX web-site mentioned that more crank lengths will be available, later. I assumed that 165mm cranks were fairly common, and that something close to this length would be included in the roll-out of the product line.
And the shortest is 110/136, which I suppose isn’t too bad but there are lots of 36er riders who prefer shorter!
On qu-ax Facebook page they asked what size cranks people wanted so they must be looking at more options , the seat post is odd I don’t see any reason to go to this size I have 125/145 on my 36 and will wait as the 110/136 are a bit close.
I think the axle / crank connection is a way better system than the current ISIS. It does not depend on tolerances of the tapered axle. Furthermore this exact system has been proven by millions of shimano cranks build over the last years. They work creek free.
My concern would be the hub itself. The axle itself is steel and the hub body is aluminium. Means those both parts are pressed together, which can be an issue (must not be). However those hubs are on the market quite a while. Is there experiance, who is running them?
Overall I also like the new Quaxes. It´s good they put some thought in them an try to improve.
It’s worth noting that both KH and Nimbus used to spec press fit hubs and they had a reputation for creaking. They’ve both since moved to one piece versions.
I bought a 27.5+ Q-axle a year and a half ago, and it’s been great, no problems at all. I haven’t been riding as much as usual because my back has been bothering me, but it’s still seen a lot of use.
I do think it’s a better system than ISIS - lighter, stiffer, doesn’t need spacers. I’ve had problems several times with spacers on my ISIS cranks when I swapped hubs and cranks, and I’ve had to rummage around in my bike parts to find different sized spacers sometimes.
I don’t know if it’s the “exact” same system as Shimano uses on bikes. I didn’t see anything on the Qu-Ax site with details. If it’s a proprietary system we may never see it on anybody else’s unicycles. ISIS does have the advantage of being shared across manufacturers.
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KH2005 was using Onza hub steel/aluminium pressed and no noise issue as far as I know
QU-AXLE is using a stopper/rib on one side made of steel directly by machining of the hub and a one piece aluminum body pressed on the hub
I guess the creaking issue with KH2009 and Nimbus Oracle hub is due to the fact that there was a big aluminum spacer between the 2 aluminum flanges; too many parts, too many interfaces …
It is same as Shimano, using Shimano tool to remove the gold nut
The fact to use 2 opposite bolts on each crank makes the bolts don’t loose their tension compared to old yellow QU-AX hub which lost always 1 crank, always on the side side …
I think you are right with that point. Actually for the Shimano cranks for bikes the axle is also steel and on the right side (drive side) the crank is pressed onto the axle, which works fine. Then on the left side they use the same clamping system as the Q-Axle. Or actually the other way round, Quax uses the same system as Shimano
Fair enough, I didn’t know that about the Onza hubs. Sounds like there are ways to do it right.
The seatpost diameter means, you can never use an adjustable seatpost to tilt the saddle nose more up. As standard seatposts leave the saddle way to flat for me, the rgb’s are nothing for me …
Pivotal seatposts come in 31.6, so you could use a KH saddle and get a lot of tilt. With the standard 4-bolt type saddles, I have to use adjustable seatposts to get enough tilt. But the pivotal posts have enough range for me.
Also, seatpost shims!
Also also; Thomson posts come in many sizes and one can swap the top plate of a KH adjustable onto a Thomson post.
Aaah, great!