I've fired 750+ rounds through my new SW99 Compact 9mm during the last couple of weeks. I've mostly been using 147gr JHP's, although I also included a couple of boxes of the W-W RA9TA 127gr +P+ loads we issue for duty. Boringly reliable so far, but then I didn't expect anything less, since I carry a full size SW99 chambered in .40 S&W.
A friend of mine bought the SW99 Compact chambered in .40 S&W (at the same time), and while he hasn't fired quite as many rounds through it as I have in the last week, his has also been reliable and accurate during his 'break in' range practice (just another excuse for trigger time

). Of course, I'm sure he'll catch up and exceed me rather quickly, as he normally tends to shoot more often ... and more rounds ... than I do. He's been trying his best to wear out his full size SW99 .40 for the last couple of years, and last I heard, he estimated he's exceeded 40,000 rounds fired through his full size model.
Personally, I feel they're a decent gun for the money. My G26 & G27 will be spending more time in the safe, since I'll be carrying the SW99 Compact more often.
I happen to prefer the 9mm models, myself, for the slight advantage I feel I gain when it comes to recoil management and overall controllability, although I've fired several thousands of rounds through both my issued SW99 full size .40, and my personally owned SW99 full size .40 ... and spend a reasonable amount of practice time on the range with my issued .40 model. I just happen to really enjoy the 9mm in the 99 design.
I don't think anyone could go wrong with either the Walther or the S&W versions, although I realize a lot of folks have a 'brand loyalty' perspective ... and that's fine ... since it's not like you can make a 'bad' choice when choosing between them. Pick whichever you happen to prefer, and for whatever reason is important to you.
I'd recommend using high quality factory ammunition, though, and following the lubrication instructions in the manual.
I may even 'retire' my 3913 & CS9 to the safe, as off duty weapons, in favor of the SW99 Compact.
Check out the Smith & Wesson Forum is you want to talk to even more SW99 owners ...
http://www.smith-wessonforum.com/cgi...r=12&SUBMIT=Go