I have been using an LG BD 590 for my main room & since getting Mezzmo running, I'm loving the interface.
It has 3 different views for thumbnails & the transcoding has helped with playback on a lot of files. However, there are still quite a few files that won't play & lots of fast forward & rewind issues.

I just purchased a Sony BDP-S580 that plays & fast forward/rewinds all of the MKV files but the interface is terrible. Looks like a PS3 & no thumbnails so far.
Is there a way to get thumbnails working or is there a player that has the best of both worlds?

I really just use it for Netflix, streaming from my computer & Blu-ray discs.