Kirk, I assume they're talking about changing the 32t sprocket to 30t. It can be done very easily using a stock belt. HD_Dude and Fullsac Steve have done it and there's been quite a bit of discussion on the subject here. Basically, you'd lengthen the axle slot on the swing arm a few millimeters.
I had HD_Dude (jim) replace my sprocket, and the difference in feel is like getting 5-10% more power; not a huge difference, but you'll definitely feel it. It will add a few hundred rpm at any given speed, so cruising at 75 mph initially felt kinda like I was in 5th gear when it was in sixth.
Also, make sure the SERT can compensate for the speedometer error caused by the changed gearing. I traded to a TTS Mastertune to correct speedometer calibration.
As far as reliability, it should make no difference at all.
Good luck,
Dan