IMO From what I've read on it to date.Haven't shot one and likely won't anytime soon.
PRO-Gives the Marlin 336 and similar lever actions 308 performace and gun nuts something to talk about play with ect.
Con- They get 308 Win peferomance with special powders only used in factory loads along with Hornadys new bullet design for the leveractions.A handloader isn't likely to match the factory ammo ballistics any time soon due to this.Both may change down the road I hope so.
So if one likes and perfers Marlins,dosen't mind staying with factory ammo,for the time being, to get the best out of it,wants one, Go For It. Opinions be danged.
Personally,If I wanted 308 Win Performance in a Lever Action Rifle I think I would go with it it in the Browning BLR.