Dunno, it was a christmas present. I think the usual price is somewhere around $130-150, which is fair if you consider that you're basically getting 6 figures that are all about the size of a $20-25 stand-alone figure.
As for standing up to rough play, I'm not sure. It's make of pretty solid plastic, and I feel like on their own each of the constructicons might hold up well, but I dunno how great Devastator will do when it's put together because some of the connection points are small or intricate. However, a lot of transformers now have joints and components designed to purposely come off if too much force is applied so that they don't fully break, so there's that too. But I've also read that Mixmaster's transformation to the left leg can be a little fragile in what becomes the ankle joint and won't handle being over-extended.
All of that said, these aren't collector-level figures, so they have to be designed with actual kids and play in mind rather than just display, so they've gotta have passed some kind of durability test.
I just figured that it must've cost an arm and a leg since I was eyeing up Transformers as gifts for the last 3-4 months.
