Only problem I found with the tins....unless you collect the tins, there really wasn't much else for incentive to shell out for the tins. I don't collect the tins, and the poster it comes with isn't enough to entice me to spend twice as much just for a metal box.
They started off on the right foot with the tins...their Double Dragster set in the collectible tin came with alot of extra parts that the non tin kit didn't have, however they seemed to have forgotten this in most of the other tins.