So my dive buddy just received hers from a big pro buy at our shop and I am less impressed than I thought I would be. The handle that I thought was a great innovation is fine, but much less robust than I thought it might be. The pro harness is just plain clunky, and with all the monoprene pieces in place it is very BC like, although the plate pad is very nice. The wing looks huge next to an Oxycheq or DGX 30, not a big fan but it does appear to be very well made.
The biggest surprise to me was how the STA (which I think is awesome) fits on the SP plate. I had previously ordered one and mounted it on my Zeagle plate, it works very well, is solid, and I wasn't surprised that the edges don't actually contact the plate since they weren't designed for each other. It still works perfectly, looks good and I love the design. The surprise is that it fits the exact same way on the SP plate. I assumed that they would meld together better. The SP plate has a nice smooth curve but essentially the two mounting holes are raised exactly the same height as the ridge on every other brand of backplate.
In the end I am glad I saw one and played with it in person before I plunked down the money as the only part of the system I really am in love with is the STA.