Yep, I drank the Kool-aid a few months after it was released, when I found myself getting back in LR shooting. I did some research/reading and went with the 6.5CM (which was a custom chambering back then) for several reasons:
1. Remington had pretty much not supported the .260Rem
2. The 6.5CM had a longer case neck. I've always subscribed to long case necks making a cartridge "inherently" more accurate (not because of physics, but because of human error when reloading. A long case neck encourages better concentricity, ala .222, 22/6mm PPC, etc.).
3. When compared to the venerable 6.5x55SE, it seemed like a good option/concept in a short action.
The downside when I lept in was that brass was pretty much made of unobtainium. But, thanks to folks like
@Rob01 , I quickly figured out how to form (and turn) my own brass. The first local match I went to, I think I was the only one shooting "that new fangled 6.5", and was amazed at the ease of wind calls (targets were pretty generously sized back then).
Is it the "best" cartridge out there? One can argue (and many do), but for something that is nice compromise between, bullet weight/BC, velocity, recoil and downrange retained energy, I'd say it's about perfect as a PRACTICAL cartridge.
Hell, I've got three now (soon to be four), so I'd guess I'd say it has proven (to me at least) to be a very practical cartridge that is competitive in matches, and can be used for hunting as well. Win/win.