Holes in the rims was a tough decision. The 47mm wide rims definately are more stable, especially for trials. So I think it is the way to go. But a solid 47mm wide rim is really heavy- too heavy in my opinion. I forget who it was (a famous mountainbiker, I think Keith Bontrager) who said “Strong. Light Weight. Pick one”.
Given that the wider rim contains more metal, have better geometry to resist twist, and that the rims are spec’d standard with eyelets and the best available alloy (7005H-T6), they seem to be about the same strength as the 2005 rims (the strong ones without grooves =)).
Cheers,
Kris