The Galt Marble Run is, so far as I have been able to compare, the best of the Marble-maze-style toys simply because its construction is so solid. The pieces themselves are not perhaps as imaginative as some of the other brands, but I'd rather have a maze that works well every time my kids build it than one that appears outlandish but falls apart because it is so un-sturdy.This set is 99% compatible with the Galt set: I've found a few pieces fit a hair loosely. But, over all, it makes a great addition. We find in this box a good number of inventive ramp designs that really do add to the thrill as kids build up their maze. The Galt sets make a great foundation; and this set serves as an excellent means of adding variety to it.