I have a Marvel Precision unit 1. It is extremely accurate and a joy to shoot. I shoot IPSC with a 45 ACP. I found that I can put allot more trigger time on my gun and not pay a fortune for ammunition. I use it for trigger control and sight alignment. I have gone to the extent of creating half sized IPSC classic targets to make my training more beneficial. Then just a few days before a competition I convert back to my 45 slide to adjust to the recoil.
If you are tired of inaccurate 22 conversions for the 1911, Marvel Precision is your best bet. Unfortunately they will cost you almost $500 USD, but that is sometimes how much people will pay for ammo in one sitting. Long term, it pays itself off very quickly.