My first block for Friday Block Party & it took me almost three tries. In the end I went with the 12" block because the 9" biases defeated me completely. Not sure if it was the little stretchy pieces or the cold medicine I have been taking although I DO blame the cold medicine for the first set of pieces in mis-matched sizes: the first two colors cut for a 9" block & the rest for a 12" block.
In the end I like the look of this block a lot, but I would probably recalculate for half- & quarter- square triangles made by sewing two squares together on either side of a corner-to-corner diagonal line, rather than fiddling with all the open bias edges. It would leave me with quite a few scraps, but then again, so did doing it 2-1/2 times.