I spoke (wrote) some about my use of DVR in the comments area for the VCR related thread. If you can't figure it out, I love having a DVR at my disposal and have found it to be a very useful device. Useful enough to quickly get past the question of paying a monthly fee to use one.
Don't get me wrong, I wish I didn't have to pay extra fees for DVR usage, and for having extra receivers on my DirecTV system (3 total active in my house at this time). I hate being nickeled and dimed for these extra fees, but I quietly pay the DVR fee because it has long proven to me that it is an invaluable service.
Before DVRs I was left using VCRs to record programs. There were hassles with having to change tapes. Image quality typically sucked. Tapes would stretch and wear and make the image quality even worse. But, the alternative was having to let the TV schedule rule my life if I didn't want to miss certain programs.
Thanks to DVRs -- especially dual-tuner DVRs -- I don't have those concerns. I can record programs digitally and watch them with no loss in image quality. I can watch programs at my own pace, on my own schedule, and stockpile episodes if I want. I can pause live TV and fast forward through commercials to help reduce the time I do spend watching TV.
Anyway, to me DVRs are marvelous devices. I'd love to get one for my family, but what stops me is the idea that they aren't DirecTV customers and getting them a TiVo box would add a monthly fee that they don't want to pay. Even if I paid for multiple years of service for them, eventually they'd have to pay the monthly fees (or I would have to pay again).
I'd suggest that they get a DVR from their cable provider (Comcast), but people that have them have said they aren't the greatest devices and my parents just don't seem to feel they have to have one. I still think they'd change their mind soon after using one, but you all know the old saying about leading horses to waterin' holes.