The Sig 1911-22 is a very well made pistol, slide to frame fit is on par with my custom made wad guns. The pistol has no problem cycling standard velocity ammo even though Sig recommends using high velocity.
The Sig is generally a well made pistol but;
Sharp corner on the thumb safety that should be ground off round, plastic non-adjustable sights that I had replaced with steel adjustable sights, five & a half pound trigger pull that prob'ly contributes to it's somewhat mediocur accuracy. This thing is definitely NOT a target pistol, altho' with a trigger job and decent sights it could make a plinker.
AFAIK GsG and Umarex ( AKA airsoft gunmakers ) in Germany makes all of them except for the Philippine version I think Rock Island and American Tactical sells those.
Reports are all over the place on all these guns. I've tried the Chiappa and it was a POS. From my viewpoint either pony up for an old original Colt Ace 22 or one of the expensive conversions like the Tacsol or Marvel set up by a pro gunsmith or go with a Browning Buckmark or Ruger you can't go wrong with those.
I've also owned at one time or another pretty much all of the cheaper conversion units on up to the Kart and Day, it's a crap shoot whether they work or not. Again reports all over the place because of the nature of the beast.