This is an update for this years hybrids. I have not selected any of these they are all volunteers from natural pollination. I have not tasted all of these yet this year as some are still small but so far, I have not had any bitter ones. That really surprises me as many of these look very similar to the wild squash.
There is also a solid yellow squash that looks very much like a yellow straight neck but with ridges along the sides. I didn't think to photograph that one before I ate it.
I still have seeds from last year. If anyone wants some send me a PM with your address. No guarantees about bitterness, shape, color, or viability.