Had a DM800 HD for 3 years; and it worked fine but this is far more responsive and the dual tuner is a massive advantage. Run black hole image as i did with the DM, cross epg updates and its easy to slot your internal hard drive. It even maintained the films i had recorded from my DM so lost nothing.
Not sure if the picture quality is less on HD channels that the DM........perhaps my video settings are not quite correct?
Easy to flash (need an image which is obtainable from the many internet sites) and effectively plug and play after flashing and FTP the usual stuff.
Looks great too with the display, makes no noise either and as of yet has been 100% stable since running from day 1. Second remote purchased from fleabay for £14 - make sure you order the latest one as the VU standard remote doesnt work.