I have the Ritcheys on two of my bikes and yes, the right pedal on the older bike (the side I usually clip in and out at stops) is wearing out after about 6000 miles. I've been happy with their performance and particularly their ease of clip-in/out, but IMO 6000 miles is not very good, even for $30 pedals.
I tried the 515's for a while on another bike a year or so ago but I didn't like them. They seemed inconsitent in the amount of force necessary to clip out, and I very nearly went over a couple of times. I may have just had a bad sample, I suppose.
Still, I'd rather have premature wear than a pedal I can't get out of. And I really need to learn to be, um, ambipedal. It would double the life of my pedals and cleats.
Training: 2002 Fuji Roubaix Pro (105 triple)
Commuting/Daytripping: 2001 Airborne Carpe Diem (Ultegra/XTR, touring wheels)
Commuting/Touring: 2000 Novara Randonee (Sora/Tiagra/LX, fenders, lights)