I had to try it when the cartridge first showed up a few years ago...plus I got one dirt-cheap. Still have that 700 sitting on the rack and I seldom use it. Ballistically they're twins when you compare the .260 to the Swede chambered in a modern rifle (not the early Mausers).
The one advantage that the .260 has is that it fits in a short-action rifle (2.8" COAL compared to 3.15")...but if you've got plans on loading the good old 160gr round nose you'll probably have to seat it deeper than the cannelure to keep the bullet off of the lands. If you're sticking with 140gr or lighter, that's usually not an issue.
The only advantage I've seen as an improvement over the old Swede is that it's short enough to cycle through a short-action.
The factory barrel twist is 1-8" for both the .260 and modern 6.5x55s like the Ruger77, Rem700, or CZ550 so it's more tuned for 140gr than the 160s anyway.
Both of em are a little spendy to buy factory ammo for...but in my area, the fact that they're an "oddball" means that as of late I've actually seen both rounds available at my local haunts...next to bare slots for the everyday cartridges like the .270, .308, .30-06, .243, etc...
Personally, I don't see the .260 replacing the Swede or becoming a super popular cartridge. I guess time will tell if it lasts as long as some of the other .308-based "wildcats-gone-commercial" like the .243 or the 7mm-08.