I just bought a P238 today, which is a 380 version of the 938, which is 9mm. The 238 has been out quite a bit longer, and has since become very reliable from what I've read. The 938 has had some issues when they first came out.. not sure if they've been resolved yet or not, but I decided to go with the more trusted P238.
Ammo cost for the 380 SUCKS though. Stupidly expensive for such a small caliber.