I've shot a few of them.
During one session, a student had one that had several misfires. It took us several instances before I was able to figure out that it was actually having difficulty locking into battery. This pistol has a normal trigger pull and drops the hammer when not in battery, using a firing pin block as the safety mechanism. But the hammer fall was sufficient to drop the slide into battery. So when you examined the pistol after the malfunction, it appeared to be a misfire, but with no primer strike, so not ammo-related. When in shooting position, focusing on the front sight, you don't notice it's out of battery, until you started looking for it.
This is not a negative, it's just a notice to know that this is how this pistol handles a failure to go into battery. It turns out, she wasn't racking the slide properly, and this little pistol wants the full force of the recoil spring. Not releasing it without letting go sharply was inducing the malfunction. It always fired properly while shooting.
I was always a fan of the Colt Mustang. Sig did a nice job bringing the concept back to the market at the right time.