My daughter, The Lovely Miss Freefall, bought a Tanfoglio Witness in 10mm about 18 months ago. She fired it about 80 times with American Eagle factory fodder, not exactly fireballs, and the the frame cracked above the safety, locking things up, and there was a small star fracture in the front right of the slide. Luckily she got her $ back, none of us will be buying another. YMMV.
ps. There are a few, if not several, posts extant on this subject. The search feature is your friend.