I got a Sony player last August. Quality is great, love the presentation. I'm pretty happy with it. The player itself is realllllly slow, however - just turning it on can take 2+ minutes before I can even get the disc tray to open out (if not longer). Loading the BDs takes some patience as well - being used to DVDs starting right up, it can be a little annoying. It's not unlike going from N64 to PS1 - you hated waiting for the load times, but once they did load, (often) the overall experience was better. That's the nerdiest analogy I could think of.
Anyway, that could be just my player, but it's not the most charming attribute. I also had to recently upgrade the software (another thing I never had to to with DVD) since some discs weren't loading up (Ghostbusters, for instance, which uses the newer Java based menus, etc.). Since I use a Mac, I had to special order an upgrade disc directly from Sony, as their website only had support for PCs. Not a big deal, but again, something that DVD never had an issue with.
Still, overall, it's great. I've only purchased about 15-20 BDs so far, as there haven't been a ton of releases that excited me, but the ones I have gotten really are fantastic, and it does seem to show an improvement in presentation of the DVDs I already had.