Pros: Price, mid range, clean
Cons: It's not ugly but a little plain looking
I've tweaked my AVR speaker settings a bit to let the center channel stand out a bit from the Onkyo Fronts (UPS delivering my matching Andrew Jones bookshelf speakers today).
So far my impression is positive. Obviously it's an upgrade over the cheap HTIB speakers I have. The Pioneer looks pretty nice with the curved top and bottom, removable grill and comes with little foam pieces that allow you to aim the speaker up a few degrees. The sound is impressive at pretty much any volume. At normal listening levels, the dialog is clear and not muddled that I can tell. Cranking it up and the mids and highs stay sharp. The size (fairly large center) allows lower/deep/warm levels of sound and has two ports in the rear.
I was shopping the obvious other centers in this price range (Polk CS, BIC etc). I've never compared any of them but I don't regret pulling the trigger on this at all and can't wait to match the bookshelf speakers with it.