You don't think you need it. And, well, you're right. You don't NEED it.
But he's right too. It will change everything.
When you want to watch a show you don't need to find the DVD you burned, just browse through the menu, all nicely categorized, and select what you want to watch.
When you're watching live TV and you look at your wife and say, "What did he say?" and you're wife says, "I don't know; I missed it too," you just skip back a few seconds and see what he said.
When you're watching live TV and decide to want some nachos you just hit the pause button, make nachos, unpause and continue watching TV.
Can't think of the name of that early Watchowski Bros. movie you've been wanting to see? Do a search on Jennifer Tilly. In fact, if you're a huge Jennifer Tilly fan, just tell the thing to keep an eye out and it will record anything with Jennifer Tilly in it.
Are you a big Seinfeld fan? Screw figuring out when Seinfeld airs and manually programming the DVD Recorder to record at a certain time. Just tell TIVO to record every Seinfeld. It will monitor every station (that's good for a program that's showing on lots of different channels at lots of different times) for episodes not already recorded.
And what if you're watching a recorded show on your DVD recorder when it's time for it to start recording another show? You've got to stop watching and put in a blank disc. Not with TIVO. It'll just start recording in the background while you continue watching the previously recorded stuff.
And it's so bloody easy to record a program on a TIVO compared to a DVD recorder/VCR. You don't have to check listings and then program in a day/time. You just browse to the program on the same menu that you use to select programs to watch and instead of pressing "select" you press "record" and it gets marked for recording.
...and so on. The list goes on, and a lot of them seem like very small things. You think to yourself, "How often do I want to pause or rewind live TV?" But trust me, these little things become like a mouse wheel. You don't even realize when the thing became an absolutely essential part of using the computer, but it did. Just the same with a DVR.
A DVD recorder will cost just as much as a TIVO and it is not capable of making such a profound change in the way you watch TV. One big change is that almost overnight you will stop watching shows that you aren't interested in. You might watch just as much TV, but it will only be stuff you really like. And you'll stop watching commercials altogether.
For the record I've never actually used a TIVO. I have a ReplayTV. Same thing.