I think I was on RCE yellows by that time, but I don't remember for certain. Here's one where I'm definitely on RCE yellows and running spacers.
http://i.imgur.com/iEv8e4K.jpg
As far as whether you should or shouldn't, it depends on what your goals are. My car is purely a daily driver. I drive it hard and take it on curvy mountain roads, but I don't autoX or track it at all. So for me I wanted it to look nice and I wasn't ready to spring for aftermarket wheels with a lower offset. When I do get around to getting aftermarket wheels, I won't need the spacers anymore, so they'll come off.
I've only ever seen wheel bearing failure from the torque added by a low offset in the offroad world, where people would run a 44x18.50 (130 lbs) on a low offset wheel so they could clear their fenders. And then go offroading on them, with all the added stress that that imputes. For us, the OEM wheel with a 25mm spacer and a 17x8+35 (TSW Nurburgring) are only .7mm different at the outside edge, with the TSW being further out. That's where the most torque could be applied to put the highest stress on the wheel bearing, but no one complains about it. Between the Nurburgring and the RPF1, it's one of the most common wheel sizes and offsets. Any additional wear it puts on the bearing would be insignificant at best.
That said, I'd remove them if I tracked my car. They'd probably be fine, but it is an additional link in the chain and potential point of failure, so there's no harm in removing them from the system.
For 5-10mm, you need longer studs and slip-on spacers. The thinnest bolt-on spacer I would run would be 15mm, because any lower won't have enough material under the lugnut and runs the risk of cracking at the lugnuts. With 15-20mm, you need a wheel with pockets in the back, because the OEM lugs will protrude through. 25mm will clear the OEM lugs.
