There has been a lot of talk about TiVo going away - mostly because of the recent loss of many subscribers. I have to say I still love my TiVo and there are several reasons why you do (or could)!
1)Hackability - try and do this with your Comcast or FIOS DVR. You'll probably end up bricking it - I've heard horror stories. You can set up a web server and other crazy stuff with TiVo.
2)Upgradeability - you can easily upgrade your TiVo. See my specs below.
3)Backupability - you can backup your TiVo in case something goes amiss (can replace HDD etc)
4)User Interfaceability - easy to use interface; can schedule recording online, via phone....
5)Connect multiple TiVos
6)Can transfer shows to multiple PCs or another TiVos
I have two TiVos now, both with lifetime subscriptions. One is an old SD upgraded to 750GB...the new one is a TiVo HD that I just upgraded to 1TB from 160GB. I really love the capacity, the ability to connect both TiVos to my wireless network on WPA.
Just felt like writing something today, mostly because of increased capacity after the upgrade from 160GB-1000GB. It is seriously sick. Took about two hours total, mostly just waiting due to the fact all settings and recorded programs had to be transferred to new drive.
Old Drive (160GB): 31hr 52min Best; 46hr 39min Hi; 73hr 39min Med; 184hr 22min Basic
New Drive (1TB): 231hr 13min Best; 341hr 24min Hi; 539hr 07min Med; 1367hr 58min Basic
If you have questions about upgrading, just ask. I'd done it previously on my SD TiVo which was a bit more complicated due to the fact it was an upgrade from 1 to two drive. This most recent on my HD was a hard drive replacement.