I sort of collect these, currently 10 in the safe. The old pocket pistols are fascinating, with some unique actions, and they shoot reliably and accurately. But...they're mostly single action. The afore mentioned Ortgies beat Glock to the punch by about 80 years with a striker fired pistol, but there are safety concerns with those, too. I wouldn't carry one of the old ones for that reason. Lot's of fun, though, and they can be had for reasonable prices.
The "modern" SA/DA guns are reliable and accurate, and safe as long as you pay attention. I have a Walther PP, Mauser HSc and an old CZ-50. Great in SA, the DA triggers are stiff. For less weight and a minimally larger outline, you can carry a modern micro 9. Great fun, though, and a great low recoil gun for someone learning to shoot a bottom feeder.
I do stick a KelTec P32 in my pocket on occasion, usually with some Buffalo Bore 75 gr hardcast. It's a good shooter, and digests a wide range of ammo. You do lose some velocity, of course. The only round I compared over the chrono was Speer GD: 1,020 out of the Mauser, 872 out of the P32. (The BB 75's go 1,031 avg out of the Mauser).