playonHD user here for a year now (also bought from SG). as far as playing movies, it's does it's job ok. on earlier firmwares (3875 and below i think) some movies (mkv files) didn't show pictures and needed to be remuxed. on newer firmwares (based from SDK 3 and 4) this seems to have been solved. i found firmwares based on SDK 3 to be really buggy so i'm currently using GUI 2.0 Beta (SDK 4). so far, ok naman apart from the sluggish menu. I also tried the hacked mede8er firmware with this and parang pareho lang naman with the other firmwares.
the only major problem that i have with this player is that I can't seem to access it via NAS mode with my computer. but from POHD, i can access my other NAS just fine and stream movies to it. then again it might be a problem with my router.
i also bought POHD2 (realtek 1185)for my father-in-law and so far, no complaints from him.