I've owned a P238 (Nitron/rosewood grip model) for one year now. Have put more than 1,400 rounds through it. As a 1911 owner, I liked the look of this little gun from the get-go. It's single action only and a very soft shooter. However, Sig seems to have had a lot of problems with its first year production run (see the Sig Forum). Some guns are running great...no malfunctions. Others are experiencing significant issues. But, it seems that Sig is working out the bugs, slowly but surely.
For my gun, Sig has replaced a rear sight, the extractor, and one of my first generation mags with a third generation mag. I've been to the range only once since this gun last came back from Sig. I was still running Sig's stock recoil spring and firing pin spring as Sig requires the gun to be in stock configuration for warranty work. I had one light strike and one FTE, which is much better than before the gun went to Sig. I've since reinstalled my Wolff firing pin spring and 12# recoil spring. That should fix the light strike issue because it fixed it before. The FTE may be due to ammo as my gun has never liked Fiocchi. We'll see.
As for holsters for the P238, mine include a Harpoon from Pocket Concealment Systems, a SmartCarry and a OWB Tucker Silent Thunder. All of them work just fine. I use the pocket holster with belted pants, the smartcarry with elastic-waist shorts, and the Tucker during coat season.
Hope this helps.