@lrhorer, you are of course, correct.
when the TivoHD was released, both mpeg2 and mpeg4 existed. It would be idiotic of Tivo to assume that "software" and codecs may one day, in the near future, cause Tivo's software to not communicate properly, and ignore an operating system structure which could be altered to follow these changes.
All you need to do is read the user manual (and box) which the TivoHD arrived with to realize that the machine CANNOT record HD programming from a cable company (if said company uses h.264). Therefore, quite simply, the TivoHD does not do what it's own advertising material claims it does, regardless of release dates, etc.
Therefore, whether you use one term or another, it is NOT functioning as advertised. If it cannot function in the future, then Tivo should be offering an extremely inexpensive alternative, either FREE transfer of lifetime service to a unit that CAN record HD material from a cable company, or a combination of low-cost hardware/service plans.
If you, as a company, manufacture hardware products that rely on third-party software events, then you better base your hardware on a platform that can be updated as well.
Tivo has one, single attribute that trumps all the others: it's SOFTWARE interface. For Tivo to conveniently ignore the part of their software that invisibly makes the machine function, so they can expect idiots to update their hardware at their own cost every three years, then they will lose me as a customer.
Tivo's sole goal should be stealing, and keeping, as many customers away from the mostly awful software that runs satellite and cable co's set-top boxes, as well as finding a solution to the ON-DEMAND limitation that those same companies have to this point, denied Tivo users from using.
Sorry, Tivo. lrhorer and myself may be in the minority, but we are correct. Fix your products.