Here’s what I wrote on another thread soliciting advice concerning the SIG P290 v. the Beretta Nano:
”My advice is to hold off a while as both these models [SIG P290 and Beretta Nano] have had teething problems, but they do have potential.
Among others, I have recently auditioned the SIG P290 and Beretta Nano since retiring as a Fed. Both were returned to the manufacturer twice, yet still had issues remaining so I divested myself of them. I still depend on the .40 Glock 23/27 and .38 S&W 640/649 I used on duty.
The SIG was packaged with an undependable, awkward laser and an equally awkward plastic paddle holster that was useless for concealed carry. Two magazines were packaged with the pistol, including an extended one which also extended the grip profile of the pistol, making that magazine awkward to carry as a spare. The original (non-restrike) trigger frequently failed to reset. Magazines would frequently unseat under recoil, especially the extended one. I have been shooting numerous semiautomatic pistols since the late 1960’s including WWII military 1911A1’s and never had this occur. On the positive side, the standard tritium night sights were excellent.
The first trip back to SIGARMS upgraded the trigger to a dependable restrike-capable mechanism and modified the magazine release to a lower profile, which brought my P290 up to P290RS configuration (the earliest P290’s cannot be so modified), Nonetheless, the magazines continued to disengage under recoil. This happened with all three of my standard magazines and, most frequently, with the extended one. Another trip to SIGARMS failed to correct this, so I divested myself of it but would recommend the P290 (without the cheapo laser and holster) once I’m assured this magazine release issue is finally resolved.
My experience with the Beretta Nano was marred with extraction issues. Two trips back to Beretta failed to solve this. This malfunction is especially difficult to quickly address due to the Nano’s lack of an external slide lock release and the awkward and flimsy magazine flooplate design. This interferes with easy magazine removal, and unnecessarily makes spare magazines a bit more difficult to carry concealed. I won't be reconsidering the Nano unless these issues are addressed.
As an aside, my worst experience, by far, was with the similar Kahr pistol (and its factory-provided replacement) but that’s beyond the scope of this thread.
All three pistols were auditioned with over 1000 rounds of quality ammunition each, so break-in was not an issue.”
Since then, I’ve acquired a new P290 RS at about the same price as the previous example (this time packaged without the cheapo laser but with the same cheesy holster as before) and have put a hundred rounds of Winchester Ranger 147gr. bonded hollowpoints through it without a single issue. Next, I’ll be testing four additional magazines to see if they function dependably. There still seems to be a very limited selection of practical ready-made holsters for this weapon.
I must add I’m quite disappointed in how SIGARMS handled the original defects in this product’s design, trying to sell off the earlier versions with a faulty trigger mechanism and then charging the consumer (about $140 including shipping) to update it. This is not the same company I knew well in the 1990’s. Nonetheless, barring the unlikely introduction by Glock of a similarly-sized single-stack 9mm this may prove to be the best choice available.
Maybe I should follow my own advice, but it seems those weapons currently at the cutting edge of compactness for their caliber (9mm and .380 in particular) are not yet quite mature in their development, and you'd be better off with something slightly larger, and more proven, like a Glock 26/27, or S&W M&P series.