Well yes I have experience with a 10mm. I may even have a few. Better still, I have experience reloading 10mm.
I'd look seriously at your want. Do you want the full size gun or do you want a compact or even a larger hunting size gun?
The 20 is the best of a lot of worlds. You get a decent sight radius and 15+1 capacity. The barrels are fairly well supported now and will endure the hotter loads without too much trouble. You'll get a bit of bulging, but it goes away in the resizing die... despite what people may say about needing a bulge buster die.
Recently, I had occasion to test my 29's, with their factory barrels and an extended LW barrel and I learned that the energy from the extended barrel is noticeably higher than the stock barrel length. This being said, if I were chasing the most energy out of the gun in a wilderness situation, I would carry a modified G40 with a KKM extended barrel to 7-8". In a shoulder rig or chest rig this extra length is not even noticed. There are even aftermarket magazine extensions that can up your capacity further should you desire.
You will be chasing brass a bit longer than you would a .45 or 9mm. This is easily accounted for with proper preparation. A set of tent poles and a well placed tarp and there's a collection of brass to be reloaded.
You can reload the 10mm to over published loads safely and get a lot of power out of it or you can dial it back and enjoy long slow roll of recoil. The off the shelf loadings from the major manufacturers are less than exciting, but the brass is great. There are deals to be found in 10mm range ammo. When you are ready, you can find some really good hot loads from Double Tap, Underwood, Reed's, or Buffalo Bore.
I enjoy the cartridge and appreciate it for what it is. You can find bigger and badder, but not in a Glock or 1911.