I just got one of these a few days ago.
For DVD movies it's a very adequate player (i'm not realllly fond of it's OSD, but it does the job and does it well).
For DivX movies burt to CD or DVD, it will auto detect folders and let you traverse directory structure etc, give a list of each playable file in each folder with no need for creating a menu.
Also picks up .srt (or.sub i beleive) subtitle files if they are named the same as the video file (extension replaced obviously).
Only gripe i have with it so far is it seems to not stay in sync (audio/video sync) as well as other players i use - but this seems to be just be on files where the sync info is more sparse than it should be... majority of files i've tested play perfectly.
As for other players, only other hardware player i've used is a modded Xbox... but i belive the DV9723P is better since it doesn't have the loud fan/hard drive that the Xbox has.