I've bought from both, and I see little to no difference out of the box. The real difference is shipping. PP ships from Hawaii, so in the States you don't have to pay for international shipping. C4Y ships from China and packs a punch on the shipping costs to westerners. I can't speak for Europe, but here in America, Puzzleproz's $16.03 total cost is less than Cube4you's $16.80 Shipping fee. I'd rather save $7 and wait an extra day or two.