What functionality do you lose if you buy a top end DVR and do NOT purchase any subscription service?

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I haven't fully-researched it yet but what you would lose is an online TV Guide. You would have to set date and time to record and date/time to stop recording instead of TV Guide "point-and-clicking". Most-importantly: in the brand, TiVo's, the unit stops operating completely without the subscription service. The recording quality notwithstanding, you turn a top end DVR into a regular VCR which you probably already own by not purchasing the subscription service.

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