I quite like it. I was stuck in the doldrums of Pioneer mixers for so long, this one is a treat. Really sounds great and I like the control of the rotary over sliders. It has a ton of great connectivity options as well which makes it versatile.
I ended up swapping out my old DJM-2000 for the MP2015, the original CDJ-2000s for the mk2 version of the XDJ-1000s, and my whole monitoring setup from KRK Rokits (8" tops and a 10" sub) to Adam Audio (7" tops and 10" sub) and I couldn't be happier with the result.
...its a very good mixer for sure, I'm on a few rotary forums and it gets quite a bad rap from the purists because it isn't analogue, but I think it sounds fantastic and there still isn't another mixer on the market that has as versatile a feature set, twin soundcards etc. Guess my only criticism would be the knobs, which aren't quite as solid as the V6/Radius-style ones, and I'd like the filter knobs to be a bit more prominent as I mix pretty much exclusively with them.
Very tempted by the Mk2 XDJ's, just wish they'd sort out the advanced HID mode so I could double-up on Traktor/Rekordbox.