I have a Jarrett 1640 and it is a great pistol. I am a bit displeased with the finish that is showing significant wear after only about 1k through it but once you find a good load very sweet IPSC gun. The heavy main and recoil springs make for more 'wrk' to operate and render powder puff loads not suitable. I have yet to play with the springs though that is in the works.
Finding mags has been a pain - long order tiem and not cheap.