Things I think tikka offers (built 3 now):
1) the lightest weight bottom metal (plastic) option available including magazine. This is alone close to a 3-6oz savings on most actions.
2) one action fits most (works for all but the longest COAL rounds in LA). Can convert short to long, mag to std, etc. all that's needed is a bolt stop (almost free), magazine ($40), and possibly a new bolt (expensive).
3) It's still the smoothest action I've messed with. And if not the smoothest, very close and at a fraction of the cost.
4) trigger is really good….and free. A $10 spring makes it a bit lighter.
5) the action itself for being full profile all steel is pretty light…for a LA. To compare it's about a 28oz LA w/o trigger. Some folks are doing some lightening cuts and Ti bolt handles it can get down to ~24 oz. That's not bad.
6) aftermarket support is not as good as r700 footprints, but improving. Many stocks available. Rings have decent options. Triggers too. Magazines if you can't make AICS work and don't want to run plastic is maybe the weak spot.
Hope that helps.