I've had an S3 for a very long time, and a TiVo HD for about 6 months or so in Cincinnati. The cable cards work very well, although sometimes it takes an experienced "dispatcher" to know what signals to send to get the cards working. I asked about a multistream card, and at that time TW in Cinci said that they do not use them at all. When you call in, they will think you have a TV set that needs a cable card; I guess that must be the overwhelming majority of CC requests, so be sure to indicate that you need two cards. I had some trouble the first time, but that was one of the first S3s in Cincinnati, but I was fortunate that my installer was very savy, and know which dispatcher to call and which dispatchers were clueless. In any event, after installation, I have had no problems other than one instance when one instance when my HBO signal was lost (fixed with a phone call to cust service), and one instance when one cable card went dead (fixed with a simple reboot of the S3). This was discovered when I noticed a zero length recording. For some reason, the cable card lost its signal or something. Fortunately, a reboot (or reset) solved the problem. Also, if you have problems, be sure to go into the card test area to see which card is getting which stations, so you can narrow down the problem as much as possible before calling TW service. Sometimes one card might be out, sometimes HBO might be off both cards, etc. In most instances, a reset put things right, so always try that first. These problems are few and far between, and are less frequent and are more easily remedied than the problems with the TW 8300 HD cable box DVR, which I gladly returned to TW when I got my S3.