Only really shot one at a local gunrange once, seemed like a nice gun and the grip was great and almost a work of sculpture on its own, think it was an all german 9mm, square trigger guard, imported probably circa 1994, the kind Pierce Brosnan was using in Tommorow Never Dies in 97'
I did consider it as a possibile .40 cal gun at first (and as a replacment for a P38 that was stuck in repair for quite some time, not the guns fault though) as well but the modern smith and wesson connection put me off, plus I have heard of trouble with the P22, the baby p99 in .22 and the PPS (which comes in both 9mm and .40) and I was kind of worried that that might mean the P99 could have been affected as well.
I dont know if any of it is true thought but one of the people who mentioned having trouble with the p22 was the guy I now call pompus and fancy, nutinfancy on youtube, something about the trigger assembly coming apart on him but knowing him he probably did something stupid with it or he just got the 1 out of a 1000 lemon of the bunch which he's had happen to him with a ruger as well.
although considering my low opinion of the guy I guess it couldnt have happened to a nicer guy.
basically try and find the early all german ones if you can in 9mm and you'll probably have one hell of a long lasting gun on your hands, I wouldnt go for .40 though for my already previously stated reasons on the searching for a good .40 thread as the P99 is sized up to .40 not sized down, ditto with .45 acp.
although that being said it could be the exception to the rule in both .40 and .45 acp