If you've got a HDTV Monitor right now and are running on an antenna, this thing is the perfect solution for you to get free local OTA HD programming. Unlike the government subsdized boxes, this box can actually output HD. I used this baby back in the day on my cruddy 26" Polaroid HDTV Monitor before it pooped out on me.
Compared with the Samsung DTB-H260F ($150), the differences between them are:
The HTL-HD can simultaneously be connected to your basic cable line, the Samsung only has one input which only works with an antenna.
The Samsung has a nice on-screen TV Guide, the HTL-HD doesn't.
Here are some photos of my old rig on the HTL-HD, it can be had for less than $50 on eBay. It's an old DirecTV box but you DON'T need a service card to use it, it works just fine on its own. It's got DVI and Component video outputs so if your TV doesn't have DVI I would opt to use the component video connection.