chixxi, you are correct, Sony Tablet S (as well as Vizio tablet) can do the same, the problem is that those were designed as tablets not necessarily AV remote controls, so you have certain limitations. The most annoying one, you cannot create macros, so you are forced to tap various buttons (on various screens) to get all your AV gear to turn ON when you have to do something.
Do not get me wrong, I have both, Sony and TouchSquid (and I also tried a Vizio tablet some time ago), but for AV control TouchSquid is much better - my personal opinion. If you are looking for a full functionality, professional tablet that you can carry with you in and out of your home, then Sony Tablet S will also be my choice. For controlling Home Theater equipment (more than a display and cable/sat box), then TouchSquid has proven, IMHO, to be much more flexible and easier to work with.