I bought a pair of Fox Van 32 R's with the QR dropout in mid 2008 and they were great, buttery smooth, tracked well, easy to service and really fit and forget.
In about May last year I bought the QR15 lowers purely for wheel security and the one big difference I noticed was tracking. Imagine you're sweeping through a singletrack corner littered with rocks; with the QR dropouts the front wheel would deflect off the rocks. With the QR15 dropouts the wheel just holds a line.
I couldn't tell you how many suspension forks I've owned since 1996, but the Van 32's are easily the best. I'm a lightweight at around 70kg and these forks are fitted to the bike I use for aggressive riding which has included two weeks of DH abuse out in Whistler and they've never felt out of their depth or given me any cause for concern.
The only equivalent RS fork I've owned is a coil Pike 454. That was poorly damped, poorly made, a dead weight and a generally awful fork. A mate I ride with a lot had similar experiences with Pikes and they seemed to spend more time at TFT than on the bike. But everyone's experience varies as you can see above!
Personally I just like Fox forks, they're engineered for the job not manufactured to a price point like RS in my opinion.