For one, you can extract your video recordings from TiVo... I doubt you can for the Sky Box.
You can't 'skip' the ad breaks.. only fast forward.
If you cancel your Sky Digital Subscription.. the box will be useless (unlike a TiVo, which you can continue to use with a VCR or whatever).
You can remote access into TiVo to set it to record, via tivoweb.
You can easily repair a TiVo yourself (Swap the HD etc).
With a TiVo you can record stuff you purchase and watch it for as long and as often as you want (no doubt the Sky box will only allow you to watch something you purchased for the time allowed).
THere's just some reasons why TiVo is better
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