I have a Witness Stock - 10mm. It has been a fantastic gun for me. No problems at all and it is a dream to shoot. The Stock is SA/DA and it has one of the best SA/DA triggers I've ever encountered. Fit and finish on the gun is exceptional. The Stock is more expensive, about $800 +/- and has some upgrades. Glock is your only other option if you want a 10mm with anything close to the capacity that a Witness has.
There are some folks who think negatively about this gun (I'm not one of them, but providing "the other side") On older models, there were some reports of cracked slides and cracked frames. Some folks have complained about EAA customer services. Some time ago, some of the magazines had either the wrong follower installed or it was installed incorrectly. You want the magazines with the orange followers. I have never experienced any of these problems and found customer service to be very responsive when I inquired and purchased some magazines directly from EAA.