The TP versions....2.0 (mine)......2.1 (DU has these)....and the latest, 3.0. 
Actually, I have a pair of 2.1s and a pair of 2.0s. The 2.1s are a definite improvement over the 2.0s, and if what we heard in Denver is any indication, the 3.0s should be a real show-stopper.

Something Mike said about one-note bass caught me by surprise, though. I haven't experienced that phenomenon
at all in my room/system. In fact, what most people are quickest to comment on is how deep and articulate the bass is. We were listening to
88 Basie Street last night, and the stand-up bass was exceptionally well-presented. Even my mother-in-law commented on how real it sounded.
Having lived with a 50-year jazz musician who played with (and has gotten drunk with) a number of jazz giants, she's heard good bass a time or two.

It's not nearly as good as the Revelation's and Infra-Wave's T-line (what is?), but it definitely isn't a one-note wonder here.