Don't know all that much about it, except my dad had one that was fun to shoot.
It's expensive to shoot though. Factory ammo runs around $120 per box of 20. Empty cases run about half that much per 20 from what I remember. Replacement barrels aren't cheap either if you shoot it very much.
For dedicated long range shooters, it's a good choice. It has essentially the same energy at 400 yards as the .308 Win at the muzzle.
Inside of 400 yards, I think it's just extra recoil, blast and expense. A 30-06 or .300 Win mag will do the same thing to an animal at 400 yards. I've killed buffalo and elk with a 7mm Rem mag shooting 145 grain bullets without any trouble. I can't imagine needing more gun for the lower 48 unless I wanted to really reach out to longer ranges.
But if long range is your game, that'd be my choice.
Daryl