I've got a JW-27, which is the same action, just with BRNO lookalike furniture. The bolt handle wiggles a lot, the trigger hits the trigger guard towards the rear end of its travel, and there are toolmarks all over the place inside the action and underneath the wood where you normally wouldn't see them. All things considered though, it's a good cheap little .22, reasonably accurate with iron sights and deadly at 25 yards with a scope. It doesn't like cheap ammo very much due to all the sharp edges, but it's a good little rifle.
As long as you know what you're getting into, I say go for it. Marstar sells 9 round magazines for those things too, just to sweeten the deal. Enjoy!