I have to say I was impressed when JRiver organized all my music across 4 hard drives within a few minutes of first using it. I actually had no idea where some of this crap was anymore.
The video sorting seems flawed, though. It got a handful of flash videos I made, a bunch of logos from the opening screens of games and programs... and a single "adult" video, which it stuck in front of it all just to be awkward. It somehow managed not to find a single movie or episode of anything.
The players seems to bug out if I move around between too many albums, but it's easy enough to close and re-open it, I guess.