Weight doesnt really matter, its the ride. The 7000 series frame just felt more noodly, even a bit dead with some frames I've had, than the Zaskars - but you may prefer it!
If it's cheap, it has a decent retro spec. If you dont like the ride, swap all the parts over on to a zaskar frame if that's what you are after. It's what I'd do if the price was right, as the bike has some parts a zaskar build would have.