Tumble has the broad appeal of any good puzzler, though it will tax your manual dexterity in ways Tetris never dreamed. Like any good puzzle game, there will be some frustration, especially with the novel contortion element.
Tumble certainly has its flaws but for under $20, it isn't going to break the bank either. Those hoping for the fun times had with Boom Blox will be disappointed, but Tumble is definitely for more serious puzzle gamers.
Ultimately, Tumble just isn't interesting. At times the puzzles can be mildly amusing, but most of the time it's pure tedium. I literally would have had more fun seeing how high I could stack a real pile of blocks.