I've run a Bonz 26'' rear rim for around a month, and I have to say it's the worst rim I've ever had. Yes, it is superlight, but it is just impossible to make it brake. I had a great set up: 100% square Belaey pads, water bled, long lever, a nice grind, everything was right (as I've always done when I had a 20" bike), but the brake was sh*t. I found it impossible to get any sound of the brake, it didn't have a fast response at all. As soon as I changed the rim (I put a Bionic double-walled), the brake became gorgeus. Same set-up, but different rim; sh*it brake, to perfect brake.
Edit: That's without mentioning that it was weak as f*ck.