the 612 is a dual tuner DVR (three if you connect OTA), but with only one tv out, so it is not the same as a 211 with an EHD, which is one tuner (two with ota). If you want more space just add an EHD to the 612. Plus 30 hours is misleading, it can fit much more because dish video is compressed, from my experience it is between 2:1 and 3:1 ratio for hd video, say when I delete a 30 min hd program from the drive the time left only goes up by 10mins for sat recordings, OTA is 1:1. In terms of reliability, have had 5 come though in a few months, well one of the replacements would just not activate so really 4, and another most likely soon. Just had a dish tech here today, 3rd in two months, and he found that the wire was not fitted correctly, fixed it but I am seeing the same problem again that the last two had so will have to get it replaced, we have two, the other replacement seems to be doing fine. The funny thing is, correct me if I am wrong, it appears the new ones are the worst, cause all the ones which have failed I think were new. The way I am guessing is that all but one had the plastic sticker covers on the front plates out of the box, the one that did not is the one that is working fine and I assume is the refurbished one.