What you are talking about is "TiVo Basic". It's a very basic level of service (limited guide data, no advanced TiVo features) that you get free with certain Series 2 third party TiVos: mostly the Pioneer and Toshiba DVD Recorders, IIRC. If you buy one of these units they come with TiVo Basic and you can upgrade later to the full TiVo service if you want to.
Of course, if you experienced the full TiVo service and what it can do, you wouldn't put up with just TiVo Basic for very long.
Of course, if you experienced the full TiVo service and what it can do, you wouldn't put up with just TiVo Basic for very long.