I have the new Silver PPK/S 22. It has shot perfectly, with one stovepipe in 550 rounds. The magazine is a little loose in the magwell. Not a concern at all. The fit and finish is very well done. It is very accurate, one ragged hole at 7 yards. The DA trigger pull is very heavy. The SA pull is light, and crisp. There is no wear after 550 rounds, and I dont see any real problems of any kind. It is not a remake of the old PPK/S 22. It is a replica. That said, it is a nice looking, nice shooting pistol. It may have a limited lifespan because of the materials it is constructed of. Or not. No one knows yet.
The barrel is threaded, because it is a thin barrel within a sleeve. The barrel is held into the sleeve/frame, by a barrel nut. This has been the recent trend with Umarex guns. The P22, Colt 1911-22, S&W M&P22, and the PPK/S 22 are all threaded/sleeved. The advantage of this set up is that by removing the barrel nut, and replacing it with an inexpensive threaded adapter made for this purpose, one can add a suppressor, or other muzzle accessory, simply, and economically. The way to tell if the barrel is captive by a barrel nut, is simply pull the slide back and look. You will see a seam about half an inch from the muzzle, and cuts machined into the nut for a wrench.
The four pistols I listed above, all make excellent suppressor hosts. The ability to add a suppressor for just the cost of the adapter($25)makes them attractive to those of us who own suppressors. Whether you like the way the way the P22 is constructed, or not, or how it functions, it remains one of the most popular .22 pistols to suppress.