The STI kit is very nice. Works great. The only thing I don't really like about it is that only the back section of the slide actually moves... In other words it loosk like a 1911 but functions more like a Browning BuckMark. The mags are fine, polymer, decent quality, no complaints.
But honestly, IMO, forget about a conversion kit and buy a GSG .22 1911. A nice full size, fully functioning purpose built .22 1911 with full size metal mags that fit perfectly into 1911 mag pouches. And it is actually cheaper than either the STI or Kimber conversion kits. You really can't go wrong with it. And other than the slide, all of the parts are compatible with standard 1911 parts so you can dress it up any way you like.