Okay, now I've heard them and seen them in person.
For me, they're not worth it.
In my previous post in this thread, I assumed PDP were using different claws on the tom hoops. They're not. All the hardware is simply parts picked from the "bass drum" bins. Moreover, the claws are cheap, stamped crap.
The finish is equal to the regular PDP lines in terms of quality; it's quite nice. The heads are different, thicker. The bearing edges are not different. So you get a slightly different sound from the regular line thanks to the heads. The heads are cheap, Chinese junk you're going to have to replace, but that's not really a condemnation as that's the industry standard.
They sound...pretty good, actually. But I could get the same sound from a similarly-sized set of regular PDPs for ... what? A third less? $900 vs $600 for a bass and two toms? And I'd get a tom holder.
My overall impression is that the PDP Concept Classic is nothing really special. They've made a kit which is only cosmetically different than their regular offerings, reduced the quality of some parts, and increased the price by a %33. The cynic in me thinks they spotted what was going on with C&C Player Date, the Hip Pig, etc. - in other words, the whole "new vintage" movement - and decided to cash in with a cool-looking (but not really different-sounding) kit at a lower price point.
Pass.
Which sucks, because I really wanted to like this.