I shoot 10mm almost exclusively. IPSC and my fun/home guns too. Reports of its death are highly inaccurate. The benefits of 10mm is the extreme flexibility of bullet weights and power that can be had, especially if you reload. I reload 200gr lead at 850fps for my IPSC pistol (Glock 20), a real softball load. On the high side, it varies between 135gr @ 1600fps to 200 @ 1270fps for JHP from
www.doubletapammo.com, a manufacturer who only loads for 10mm. Or up to 220gr hardcast @ 1125fps for hunting, or he even has a 230gr two-projectile round.
Large factory loads are very weak, thus the comparisons to 40 S&W. Only the 175gr Silvertips are near proper 10mm velocities, and I hear they are slipping a little too. You have to go to a specialized maker like Doubletap, Georgia Arms, and some others to get all the potential out of 10mm. Before I reloaded, I shot 10mm FMJ practice ammo from Georgia Arms, $190/k. That's a medium load of 180gr @ 1100 fps.
You can usually shoot 40S&W out of 10mm guns with a reasonable amount of safety, and since the other dimensions are the same except length, a drop-in barrel is easy to get if you want to shoot alot of the cheap 40S&W practice ammo.
I don't participate in the caliber wars (except I know I'm right LOL

). But when I see a guy shooting 10mm, chances are he is a serious shooter. Now if I could just find a nice S&W 610, and a Bren 10, and a Colt Delta, and a Witness, and I think CZ makes a 10, and a 10mm AR15 upper, and a 1076, and...