Quote Originally Posted by petestrash View Post
Right now if Hybrid goes down (or they decide to stop supplying you EPG), your TiVo HD will become a useless brick about a month later regardless of which PROM is installed.
One point to note is that depending on who does the mod, some will fit the new PROM into a socket and return the original chip as well so theoretically with a little care extracting the modded PROM from the chip socket the original can be put back in.