"I love the high part count and complexity of the set. I said it took me 10 hours to build but, I built it over the course of a few weeks when I had time. I actually bought two sets so I could build the aggregate separator and have them work together. They don't. :-( The conveyor for the BWE is too low to feed the hopper on the MAS. Oh well, the kids LOVE playing with them at the kitchen table. I also bought a half gallon size plastic bag of extra "rock" pieces and put them in a glass cake pan and let the BWE scoop them up. It's a great set and I love looking at them every day as they are on display on my chest of drawers in the master bedroom. Glad the wife is long-suffering!"