I've got the sub and towers set up from the HTP-351T 5.1 set. My main theater has Ascend 340-SE's and 170-SE's, so I can offer a limited comparison if anyone wants. I was also at CES a few weeks ago and heard some $50K speakers to as well. Getting an entire 5.1 tower set for the price of a speaker cable there makes me feel good!
How does it sound so far? Great! Two towers and the EMP 10s sub make a killer combo. The speakers are less sensitive than my Ascend setup, but once you put power to them, they move. I'll move some of the Ascends around and give some A/B comparisons, as well as a more in-depth review of the 5.1 EMP system.
Also, beyond the sound, EMP is great to work with. I got to put faces to their name at CES, and also I have had numerous e-mail communications with them. Top notch staff, especially to Daren. This guy deals with a lot of big fish, but gives just as much attention to small fish like myself.