Purchased the 9mm version but for sure will be getting an upper (already ordered) in 10mm. Sold off my Razorback which sold today since it was the odd man out.
Shot everything today with the stock spring it shipped with (weak as crap) including the 1472 FPS/ 553 LB Underwood 115 gr. Zero malfunctions and so far it feels like a real recoil eater. Maybe the extra heft of the full dust cover and cone-loc barrel helps a bunch on the front end.
I didn't know how I would like the flared magwell but it is awesome! Makes me want to put one on my other two Witness pistols and I just might do that. It's like having a bigger handle while shooting and loading the magazines with the palm of the hand is stupid simple and fast! My plan is to change the upper over to the Limited Pro 10mm with 20lb spring and see how it does with some nasty stuff. So far it is panning out to be my favorite Semi!