I've been watching this system since Gear.IGN.com's review, where it "performed like a champ". I got one in a TD7700 system and in truth, there are some caveats.
The DDTS-100 is a fairly nice bit of kit, supporting all the key audio formats for 5.1, 6.1 and 7.1 surround sound systems. DTS Neo:6 is superb for Dolby PL:2 GameCube and PS2 games, for example. It's got more than enough inputs and outputs for a pile of kit (removing the need for an optical switcher) and the sound quality is, to my ears and on my speakers, very nice.
The only drawbacks are:
1) The balance controls only let you change the volume of groups of speakers: centre, front, side, and back. Obviously no good if you've got to adjust the left to right balance.
2) It defaults to a "quiet mode" which must be switched off with the remote when coming out of standby (although truth be told, it's not too restrictive on the sound)
3) It doesn't do bass redirection. This is where the system takes some of the bass bound for the satellite speakers (which generally don't do bass very well) and send it to the subwoofer (which obviously handles bass nicely). This is essential if you're trying media which doesn't use the .1 channel on a 5.1 system. Otherwise, the subwoofer will be silent for everything but explosions. Not great for music listening.
There's a reason for (3): conveniently all Creative's surround sound speaker systems do bass redirection in the amplifier, so if you pair this with one of those packages, it actually works out okay. Cunning, eh? If that floats your boat, Creative do such packages (available on Amazon). Or you might already have Creative speakers. If not, you may want to steer clear.