Hello and thanks for the forum. These little .22 conversions are one of the best I've ever seen. I have one on my SIG P210 and it's not reliable. I have a Kimber conversion for my 1911 and neither match the Kadet in terms of reliable function and accuracy. The SIG's is accurate, but just not reliable and spare magazines are in the $90 range! The Kimber's reliable, but the conversion's not nearly as accurate as the Kadet.
Best.
PS: Neither of the other two have CZ's great support, either.