It works extremely well. I started off with Shiva's then changed to the DLP12 when they were offered at a very low preproduction sale. The difference is performance in minimal.
Another option for those needing a good 12" would be the 12" TC2+ offered by
www.oaudio.com These have a low Fs and a nice highish Xmax. We've done some distortion testing and the distortion is quite low