In long run, WAY too little for WAY too much.
OK, it's semi-interesting and all, and it's colorful for sure, and I love Mobius strips, but . . . . .  This think is MUCH (MUCH!) smaller than I expected (my fault?), and it doesn't really 'do' anything, and you'd really have to be a math type to realize the mobius strip part.  And it's too small (about size of nickel or quarter) to play with as a 'stress reliever'.  In the end, my reaction is/was "I paid $9.99 for THIS?!"  I don't necessarily DIS-like it, but I wouldn't even pay $2.99 for another one.
Rating: 3 stars