Had my first two experiences with the new bins recently, and I thought they worked well. I have a Briggs & Riley baseline 21" bag (global, not the 22" domestic bag) and it fit perfectly into the new bins in both F and Y. I didn't try to measure, but it looks like the port-side F bins are only a little bit larger than the old ones, and the starboard side may be a little smaller, but not much. In Y, the bins on both side appeared to be the same, and they seemed to match the size of the starboard F bins.

I didn't notice any particular loss of room above the window seats; the aisle might have been a little more claustrophobic.

I'm not sure if it's worth having someone add a column to the Fleet site or not. My flights were on N135SY and N156SY.