Love it. I have the ATI GSG-1911, which is exactly the same thing. I have the tactical variant with the rails and fake can. Not sure if Sig are selling that type. Very accurate and uber fun to shoot. Trigger is quite nice. My only downside is the finish on the slide. It gets scratched easy and finish is not as durable as I would hope. The frame is solid though. It requires High Velocity ammo. Mine likes CCI Mini-mags, Federal Bulk, Winchester XPERT22 - actually, anything HV rated (greater than 1250 fps velocity). DO NOT USE standard velocity ammo.
Field strip has some quirks as well - not a bad thing, but a little different from a standard 1911. You will need a hex key to take off the slide and the recoil spring needs to inserted small end first towards the rear. It also has a rubber washer that gets pretty banged up after a while that needs replacement. Mine came with a spare as well as extra sights.
I've put over 1.5K rounds on mine, probably 200-300 rounds per trip. I had a few feeding problems during the first 100 rounds but that went away and now it's just a pleasure to shoot.
Here's a pic of my toy:
Here's a pic from my last range trip:
