I've got the Sony DHG-HDD250 unit that I use with a rooftop OTA antenna in Brooklyn, NY (11215). I'm simply blown away by the quality and amount of programming I can receive. Many digital channels have a number of sub-channels. While some of these are quite useless, I (or rather my 4-year-old son) really enjoy having PBS-Kids at 13.2 and a 13.1 HD channel with mostly distinct programming from the regular analog channel 13. Then there is 13.3 which mostly has reruns of various PBS material.
Thirteen already was one of my favorites, but now I've an instant collection of over a 100 recordings of my son's favorite PBS-Kids episodes (Caillou, Thomas the Tank Engine, Clifford, Dragon Tales, Mr Rogers, Sesame Street etc) and much unique PBS HD programming at my finger tips. Also, while analog Thirteen always has some annoying horizontal line noise, the digital channels are generally flawless.
Then there is the TV Guide, which I feared problems with given all the trouble reports here on AVS Forum. I had zero problems, after the guide started populating. Even the PBS sub-channels have correct guide info. Operation is super easy, for unmatched spousal approval factor. We rarely if ever watch TV live. It's just too nice to be able to pause and later skip any commercials.
Now, after a year and a half of using this unit (just a few months of which with a HDTV flatscreen monitor), I can say my money was indeed much better spend on this DVR than it would have been on cable. The OTA reception is far more reliable than cable. The only outage I've had was when my neighbours cable guy messed with *my* coax and hooked me up to Time Warner cable with a lousy signal by accident.
I paid just over half of what Lindahl quoted for a returned unit in one of the common brick-and-mortar stores. I'd say: look for a good deal and never look back. My only regret? I should have gotten the 500MB model. Also, the unit tend to run a bit hot and need to be put in a ventilated spot. It really is always on (HDD always spinning). Ignoring my own advice, my unit is out of sight in my entertainment center and generally records about 110F, which is a tad high for long HDD life.