Not to mention that .22 WMR rounds are 3-4 times less expensive than 5.7mm. They're also less powerful, but still relatively powerful. Apparently Kel Tec solved a chronic feed problem with this caliber.
I like it just on general principles. Now if I could just figure out what I'd do with it, I could justify it : )
The CCI 22 WMR rounds they recommend are $10-13 for 50 rds and the FN 5.7 x 28 go for $19-23 for 50 rds where I live. They are relatively powerful and I enjoy shooting my 22 Mag revolver. At an average cost of $500-550 it is an expensive plinking gun. The 57 is quite powerful & effective for its small caliber but at around $1100 is quite pricy for what you get. It is a great sidearm for the P90 AR. I believe that the PMR-30 was designed to be a poor man’s FN 57.