It's probably better to talk about what the RCX does better than the other SCTs, which it resembles much more than the R-Cs. It's got a faster f/ratio, a lot of cool doo-dads (which I hope Meade is now committed to gettin' working), and a very good field edge. The gurus may tell you that this aplantic SCT doesn't deliver images that are quite as sharp at the field center as a standard SCT, but the fact is that stars are tighter at the edge and that the field looks better to the eye and the camera.
What would convince me to buy one? Other than getting the bugs out, offer the f/8 RCX as an OTA only.