I have used the TW PVR for a month. It was nice in some aspects:
1) $10 / month (no up front cost)
2) picture in picture
3) record 2 things at once

down sides:
1) no indication of free space remaining
2) immature conflict resolution
3) only comes in 40G size
4) I really missed my ReplayTV commercial skip feature

For the price it was acceptable. It is WAY better than watching live tv!
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Cheers, -Doug Morrison Mk2-32G Back light buttons, Neon red screen