The Sony can only record line of sight but is supposed to have more usable channels. I've heard the old and new $500 Sennheiser can still record if you go in a building around walls etc. Sorry I don't have Senn. model #'s. Any advice or comments comparing these two?
Well, they don't record anything, they are just wireless systems, and in my experience they perfom the exact same. Both can go through walls...to a a point. I would use either one.