I've had a Hi-definition TV for a couple of years now. If you haven't seen real Hi-Def you don't know what you're missing - its a pretty spectacular upgrade in picture quality and sound from regular standard definition TV. I get my Hi-Def picture via Time Warner Cable, and as far as cable companies go they do a pretty decent job with Hi-Def.
The one downside to my switch to Hi-Def was that TiVo didn't (couldn't) support it. I could go into the reasons for it but I've already covered some of them in the past. So I had to switch to Time Warner's DVR.
While TW's DVR isn't awful (its actually gotten better over the last 2 years thanks to firmware upgrades), it still is a shadow of TiVo's power and flexibility (not to mention that it still occasionally "forgets" to record shows). For one, TiVo's guide has 2 weeks of data versus TW's 1 (this becomes a big deal when you are trying to record a program for next Wednesday and its Wednesday of the prior week or earlier - you can't). TiVo also lets you search for programs while TW's DVR will not - you have to find the program manually, which is a real chore if you don't know when it runs. Add on TiVo's wishlists (e.g. record any movie with Humphrey Bogart) and TiVo suggestions (TiVo will automatically record shows that it think you might like based on your viewing habits) and all the networking features (like playing MP3s from my computer upstairs).


Anyhow, a couple weeks ago TiVo released a DVR that supports CableCard. This is a new technology that essentially wraps a mini "cable box" inside the TiVo. Now it can support digital cable - including Hi-Def! I bought it and returned my TW DVR. Long story short - it doesn't disappoint (well, it has a few bugs but TiVo is working on them).
The downside of this is that I've found so many new and cool TV shows to watch since getting the darn thing that I've become a real couch potato. I've also gotten hooked on a few old shows (like Scrubs and The Venture Brothers) that I never wouldn't have watched if TiVo hadn't suggested them. I'm sure once the novelty wears off I will go back to more normal viewing habits, but for the time being i'm a damn Hi-Def couch potato - and I'm lovin' it!