After reading all the horror stories on here about CableCards I was prepared for the worst. But my cable installer came out with a MCard and a regular CableCard. The Tivo informed us that since the MCArd was installed we didn't need a 2nd card in the 2nd slot. The installation took a bit of time-but when it finally started-it all worked perfectly!! Everything went smoothly and I'm thoroughly impressed. Does anyone else have a MultiStream Card? I know I'm uninformed but I wasn't even aware of their existence.