Sorry for the double post, but I thought it was a good idea to give you a complete review about my hubs I rode since April 2009.
April 2009 to April 2010 :
I received a 36", the wheel built by unicycle.ca, from a batch of 4 hubs which 3 of those had the big bearing problem, mine was the good one 
After 1 week of riding one of the shifting button broke. The customer’s service between municycle, Florian and I was a mess. It took 2 months to get the button. Anyway, I rode ~ 4200 km of complete hapiness and felt in love with my hub!! Over this time I broke 20 spokes before I sent this hub back for repair. Once again the customer’s service wasnt effective. Florian told me this hub was gonna be repaired very fast, so I shipped the hub by express post (that was expensive). It took 3 months for the repair :(. I bought another hub at the same time, so I received 2 instead of 1 :D.
July 2010 :
Now I have my repaired hub and installed it on my 24" muni. The new one goes on my 36". Three weeks later the repaired hub had the same problem I sent it back 3 month earlier for 
. I tried to contact Florian by emails without answers, so I came on this forum and someone told me to repair it with locktite. This is what I did. Since the repair I rode my 24" for long distances and alot of muni/xc, for a total of 2500 km, and the locktite repair is still good. Also 1000 km out of these 2500 were in Quebec winter’s conditions, that means salt all over the roads and -20°c and below. There I realised that this hub is something strong! The only problem I had was in very low temperature (-30), the gear froze when downshifting, but after a very short moment (within a second) it released and was alright, without bail. And salt = rust. The hub went rusty on the steel side. The black side has no rust at all. I cleaned it up last month, and had to clean my bearings too, 'cause the rust came inside both bearings (the big and the small one).
About the 36" hub, it was perfect untill today, it has the same problem than the other hub had. This won’t be a problem to repair it by myself, and anyway I had to rebuild my wheel because 8 spokes broke since July. I rode a total of 2500 km with this new hub before the first minor problem appear, not bad 
As Kris said, we need to do some maintenance over the hub and this include taking care of the shifting buttons. There can be rust/dust in it, so you need to screw and unscrew the shifting button’ inside lock totaly to avoid it to be stuck (and add some grease). It happened to my friend and now both button’s lock are stripped. Yesterday he lost one of his buttons in a ride. I dont know what is the worse part : loosing a part of the hub, or knowing there’s no way to get a schlumpf’s spare piece quickly.
Also I found out that riding with a loose crank will eat up the crank’s spindle (hopefully this is the crank, not the isis axe. The axe seams stronger than the cranks). You will see that everytime you tight up the crank’s screw, the crank come closer to the frame. There’s a point where the crank’s screw is tighten to the max and the crank is still loose and touch the frame. When it happens you must switch your crank left to right or buy another crank set. I had this problem twice, and cost 100$ each time.
I’ll conclude with 2 tips. First one is about building the wheel. The first times I built up my schlumpf wheels I held the hub on my legs while lacing the spokes. But it is much easier to use the unicycle’s frame upside down, and use it to support the hub. Second tip is about shifting. Since 2007 I use ankle brace protection, and it allow me to shift easily and without pain at the malleolus. Also it saved my ankle in a very bad bail (dropping a quarterpipe at high speed on my 24"). I broke my fibula in 3 parts, and riped off a ligament on the otherside of the ankle. The ankle brace held my bones together, when taking it off my ankle flipped to the left (that hurts !!). 5 months later I was riding New-Zealand’s mountains after Unicon 
With a good maintenance and care, the Schlumpf hub can last for many, many thousands kilometers! And I want more !!
Jean
