I have a SA 1911NM frame .45ACP I built up in the early nineties, and I also have one of the early Ciener .22LR top ends for it. This package needs more ammo testing, and it really does need high velocity ammo as well. I'll sort it out more when warm weather finally arrives here. The Ciener was the first of the "new" .22LR conversions, and mine is not particularly oriented to match accuracy. It came with fixed sights, and I added an cheap aftermarket adjustable rear sight. It shoots well enough to enjoy shooting it, particularly as a "range gun" for cheap practice.
From what I can tell, the Kimber .22LR switch-top is a decent package--I looked at one, as well as a new Target / complete, and there's no reason it shouldn't shoot well. With at least three manufacturers out there now, the competition has improved both the features and the quality, I suspect.
My favorite .22LR switchtop is a variant--it's the EAA Witness large frame and the EAA .22LR conversion kit.
For those of us who like 1911s--and they are my favorite semiauto design--the CZ-75 "update" to this design is a worthy expansion of the 1911 ergonomics and 'modern' features. The Tanfoglio / EAA version of this design is not only a good value but lends itself to the .22LR conversion.
I bought a EAA Elite Match 10mm back in January, and was very pleased with it. Then, the .22LR conversion kit arrived in February; I'd forgotten I put one on back order. The conversion fit well and works fine, but I have yet to sort out its favorite ammo.
When my .22LR conversion arrived, I was pleased with the fit to my Elite Match (and with the fit on my older .45ACP Witness frame), and the only real negative is the poorly-finished internal machining. However, it shot just fine--and it seems to prefer FC standard-velocity match; no FTFs/FTEs.
The standard EAA Witness sells for about $400.00 these days, and the Elite Match series has a "match" barrel but still no bushing (in any caliber) and sells for about $500.00. The Elite Stock does have a fitted match barrel and a bushing and runs about $700.00, I think--and the .22LR conversion is about $200.00.
Depending on one's interest in accuracy no matter the centerfire caliber, one could have a match-accurate package for perhaps $1000.00 total, including extra magazines.
If you're interested in looking over the EAA Elite Match, you can read my mini-review
here. The review includes a comparison with my Kimber ST II 10mm, and some add-on comments about the .22LR conversion late in the posts. I'll be updating the accuracy info shortly.
Jim H.