I carry a glock model 29 10 mm as my conceled weapon. If you are looken for punch in a reasonable size package, that come stock with 10 rd mags then this is it. But there is some down side to the 10mm. The first being ammo, if you reload, then it is not to bad, but if you shoot factory ammo it can be a huge P.I.T.A( many times when u are in gun stores and u ask about 10 mm you will get a blank look) to find ammo.
I have been using winchester 175 silvertip ammo, and the last half dozen times I bought it(all at gun shows) they have been around 20 bucks for 20 rounds. Not to bad, but you have to look for it.
The second with factory ammo is alot of companys down load it to right at or a little above .40 s&w, which in my eyes is kinda pointless. Buffelo Bore has some full power loads for it but I have yet to see any of it local(shops, gun shows, etc).
From what i have read, the 10 mm with full power loads in the 1911 setup can really put a beating on the gun. Don't get me wrong, if i had the chance and the money i would love to have it in 10 mm. For the money i think glock is the way to go for the 10 mm.
I bought my glock used and over the last 3 or so years have put over 2500 rounds through it. Out of all of those i have had only 3 ftf with it(all with the same crappy ammo). My gun was thought to have 3 or 4 thousand rounds through it when i bought it.
the only problem i have had was a broken dissassembly spring(it still fired but i couldn't figure out why it felt "sloppy" during recoil until i dropped the mag and metal pieces fell out). the part was like 5 or 10 bucks and it took me all of 5 minutes to replace.
All in all I love the 10, but it is not a widely common round, good ammo can be hard to find. If you reload, it is not that big of a deal, but if you don't it is something you need to consider when contemplate'n a 10 mm. i hope this helps you, and if i ran on to long i do appoligize.
will