I have shot one - I was at the range a couple of months ago, and I guy had a new one he was trying.
For the size, I was amazed at the low recoil. It felt nice.
However, he was having a lot of feeding issues. I have also seen comments reporting the same on many gun forums. Not all of them seem to have this issue - as I've seen some people state that theirs works great. But, the number of reports I have seen are enough to give me pause if I was in the market for one.
Also, I have seen a lot of comments about the sights being slightly off. His was off a bit too. And, since the gun is new - there are no aftermarket ones yet.
I prev had a Springfield TRP with the same style of sights - the Novak tritium w/ a SILVER ring around them. Instead of putting the nice white ring around the tritium like the trijicon novak's have, they are using a cheaper trotium novak sight. The front dot is extremely hard to see if you are at an indoor range where it's not quite dark enough to see the tritium glow.