Both of my sons love the action this set provides between the little ore train, conveyer belt, drilling car and delivery truck. There are some great "rock/mountain" pieces. Its an OK build and I personally love the drilling car- it is nicely designed and works well (does not fall apart when you put it into action). The truck is pretty standard, nothing special. The ore train and conveyer belt are nice. Other observations: The miner helmets are well done, love them. The "gold ore" pieces are disappointing. They are not really gold in color and the shape is strange (although I can't blame Lego for not wanting to mold new pieces just for this set). Other details are good, like the dynamite. The price is where I have a complaint. At this price point, this set needs one more minifigure, especially when you consider all the action taking place at this mine: truck driver, ore train driver, conveyer operator, supervisor in the office, drilling car driver, etc. Also, its clear this mine is designed after a mine you would find in the mountains (as opposed to a strip or pit mine). A couple of the classic Lego evergreen trees would help sell the fact this mine is indeed in the mountains. The build could be better. We had it built fairly quickly. To put into context, we got the latest Millennium Falcon on sale for about $10 more than this Mine set. The Falcon took a lot longer to build. The pre-molded rock walls in The Mine are to blame- they help make the set look bigger and mountainous, but offer very little build challenge. Final thoughts: This is a tough call. The set provides a lot of action and has some nice features and pieces. It is expensive, though, and needs a few more things included to make it a good value. We like the set, but I keep thinking the money spent on this could have been used for several smaller sets to build up our City or Star Wars collection. Or, the money could have went towards a set with a more challenging build, like the Horizon Express. If you like the Mining spin-off of Lego City, you should get this. If not, I would say you should pass unless you can find it on sale. To me, this is a set that I say "if only it had ____ or ____, it would be great." (you can fill in the blanks with minifigs or trees, or lower price or more challenging build, etc).