Feature	ReplayTV	TiVo	VCR
Hard drive upgradability and other hacking issues	None. It was thought firewire upgrades would be supported, but that never happened. Some users have performed their own warranty-voiding upgrades. Information about this may be found in the hacker section of the ReplayTV Advanced FAQ. Those interested might also find the reading at the AVS ReplayTV Forums helpful.	None since Philips quietly discontinued their upgrade program. However, user updates have become exceedingly popular over the years. You will void your warranty if you try it. For more information, visit Hacking The Tivo FAQ, Unofficial TiVo Hackers Site, the TiVo Update Center at AVS, and the Hinsdale How-To.	N/A, but new videotapes are cheap
Usability without service	Useless out-of-box; requires service to configure or change lineups. All functions will disable themselves without service. Lifetime subscribers can still do live TV buffering, manual recordings, and instant recordings. (see Recording and scheduling for details).	Useless out-of-box; requires service to configure or change lineups. All functions will disable themselves without service. Lifetime subscribers can still do live TV buffering, manual recordings, and instant recordings. (see Recording and scheduling for details).	Hey, it's still a VCR
Staying power	In the market since early 1999. ReplayTV had the headstart in media attention, but gradually lost their lead and settled in as the runner-up in the marketplace. In late 2000 they shut down their manufacturing division in an attempt to refocus. In mid-2001 SonicBlue, electronics manufacturer, acquired ReplayTV. They came out with a new line of ReplayTV units and packed in quite a number of great features, but some of them (internet show sharing and commercial advance) were the target of lawsuits. SonicBlue applied for bankruptcy protection in early 2003, and they were bought by Denon and Marantz Holdings, Digital Networks North American group shortly thereafter. To avoid future lawsuits, new ReplayTV releases from DNNA do not have the controversial features. Let's hope ReplayTV has finally found their footing.	In the market since early 1999. TiVo got their units out the door first. It didn't take long for them to overcome ReplayTV's strong pre-release PR and take the lead position in the marketplace. Since then they've been going strong, entering the hardware manufacturing business for the first time, in 2002. TiVo nomenclature has entered popular culture, and it's getting rare for people to ask, "What's a TiVo?" I don't see them going away any time soon.	Everyone has one