I have one Pro, well not really as it was sent back due to being defective. I have 3 R's that have worked fine since the beginning. I have 2 S's, one was defective but fixed by my brother and the other has been fine.

So overall, my failure rate on Reventon's is 33%.

The failure that was fixed was components not being properly soldered. I will be taking the rest of mine apart once the warranty expires to verify they were assembled correctly. This won't keep me from buying more as they are a good value and SP stands behind them.