I have two Witness handguns. A full size Wonder finish in 10mm and an Elite Match in 10mm. Both are great guns. The full-size took about 500 rounds, a 22lb Wolff spring and +15% mag springs before it settled in. Prior I would get 1-2 ftf's in the middle of each magazine. The Match has been flawless although it got the Wolff spring treatments too.
The Match is far more accurate than the full-size, although the full-size has perfectly acceptable accuracy. But where the full-size has a combat group at 25 yards (< 4") the Match has a small group (<2" on a good day). At shorter ranges, the full-size makes a 1"-2" group and the Match makes a ragged hole in the paper. Unless you gotta have DA, the Match is an extra $100 well spent.
I would warn, based on my research that you stay away from the 'rounded' slides in favor of the 'square' ones. For examples of the two compare the Witness P slide to the Witness P-Carry slide on the EAA websight. The 'square' ones are a little rounded still on top, but have far more steel than the 'rounded' ones. The 'rounded' ones have been reported to crack, usually in the 10mm with it's corresponding high velocities and pressures. I beleive at this point none of the steel Witness have the 'rounded' slides, and I no longer see any of the Witness-P's that have them available in 10mm. The P-Carry is available in 10mm, but has the stronger 'square' slide.
I have heard horror stories about EAA customer service. I have required no service on my guns, so I can't comment. I did interact with them while looking for my Match, and the were courteous and professional. I am actually considering picking up a Bounty Hunter from them in either 45LC or 44 Mag.