I have a number of Sig pistols, the P-245, 220ST, 239 and 228. Mine are all older models without the rails. The 245 is one of the best carry pistols out there- light, accurate and reliable. It is 6+1 of .45 and takes 8 round Sig 220 mags as well. The 239 is also a great pistol, but a little large for the number of rounds it holds (8 in 9mm). The 220ST is a great home or range gun, but too heavy to carry. The 228 is thought by many to be the best 9mm pistol Sig has made but it is a little too fat in the grip for me (I prefer the SW 6906 in a double stack 9mm for carry).
So in summary, they are generally great guns. I am not impressed with the latest offerings from Sig however. I am not fond of rails, the prices are steep and they were shipping with only one mag until recently when they switched back to two mags. The trigger reset can be a little long unless you have the SRT (short reset trigger) installed.
So mostly good, some bad in my opinion. Still hard to go wrong with a Sig.
best wishes- oldandslow