I bought a Tikka T3 Varmint Heavy Barrel .308 in January and love it, smoothest action I've ever used and accurate with factory ammo. I've had it out in -30 shooting for hours with no problems.
As for the plastic parts....I think of this and laugh. The reason why we recycle plastic is because if it's put into the garbage system it will sit INTACT FOREVER. No matter what the conditions. Just food for thought, plastic is long lasting and durable, definately does not have the look or feel of steel but definately gets the job done.