Vicdamone - I find the + to be a bit quicker and fuller, terms which of course I have no desire to even Begin to measure :-). The best thing I like about it is being able to make adjustments, especially volume, on the fly using the remote and the display on the sub itself. That's a great feature, because some songs sound best with just a bit of extra bass, some with more.
Bill- If you get a chance to check out these Elite Pro Tv's, I think it will be well worth your time. They blow away anything I've seen both last year and this. They can also be adjusted to be almost "plasma-like" if there is such a term. I got mine from Robert, the Owner of Value Electronics in Scarsdale, NY. He's quite active on high-def forums and a genuine nice guy - definitely at least worth a call, if you're curious.