This was a really awesome idea. I put the starter track together (with another track) in less than an hour. And the hour was only because I didn't put up the starter set 1st. The second set was easy to take down and replace. I did however, use a different set of 3M Command strips. I used the picture hangers... they work like velcro. Either way, once placed they are easy to remove.
The only reason I've given it 4 stars instead of 5 was that the instructions were not as complete as I would have liked them (i.e. must place racetracks on wall in this order, if you plan on connecting more than one set, leave X feet). And that we are using both cars that came with each set, but they only complete the whole track 3 out of 5 times. But, after some toddler explanation, we understand that sometimes cars make mistakes too.
However, I love that I've had this racetrack up for three weeks and nobody has stepped on a car (I'd recommend the storage unit as well though). I have a 3yr old girl and 4yr old boy who have spent some quality sharing time together with this racetrack... which in my opinion doesn't happen very often. It's the best time for Mommy to get in some quality cleaning time :)