I've had an SIS Ultra for several months and it's been very reliable. I've only fired about 500 rounds through it, but it cycles perfectly, including Hydrashoks. I was leery of getting an aluminum framed 1911, so always stayed away from 3" models, but the SIS Ultra has a steel frame and a steel MSH. And it does not have the Swartz safety system. It has become my carry piece, along with an Aegis II Ultra.