I have never owned a Glock in any caliber, but have a bit of experience with the 10mm round. My current gun in that caliber is a 12 year-old Colt Delta Gold Cup, no longer manufactured. I did a few things to it, had a better trigger installed and also a beavertail. I also did away with the goofy double recoil spring in favor of a straight, heavy-duty one.
If you reload, ammo is no more expensive than 40S&W or 45ACP. I found some reasonably priced PMC factory stuff just the other day and got a box to try out, but haven't done so yet. I find that the 10 with warm/hot loads chucks your brass way over yonder, so plan on losing roughly 1/3 of mine at the range, and close to 100% in the field. Oh well. Just like automotive horsepower, you pay more for the extra grunt.