OK, I'll go against the flow here. I used to think having a separate .22 auto pistol was better than a .22 conversion on my 1911. And, after I bought my first conversion unit from Wilson about 10 yrs ago, I still thought a separate .22 pistol would be better. At that time I believe Wilsons were made by Ciener, and really weren't top quality. Although it was functional, the accuracy was mediocre. I sold the Wilson and bought a Ruger Govt Model Target, Browning Buckmark, and S&W Model 41. The M41 was the best shooter of the three. I was highly satisfied with the M41. But, then about a year ago I bought a used Marvel conversion unit (type 1). In side by side, bench rest, accuracy testing against my M41, with all types of .22 ammo, the Marvel unit proved itself to be as accurate in every case, and more accurate with about half the different ammo, as the M41.
Today, I recommend the Marvel conversion unit over all other .22 conversion units, and over all .22 pistols. And another big plus is that you have the same grip, trigger, and operating controls as your favorite 1911.