So I FINALLY got around to swapping out the old valve for the new. Before I did I used my newly acquired X-Chrono (finally got to use it as well) to see if there actually was a difference. With the old vale I was shooting about 260 fps but it varied anywhere from 230-270 fps. After I installed the new one, with everything else the same, I was shooting high 280s-low 290s. Certainly made a difference in velocity and the consistency seemed better. My stabilizeer is not quite broke in yet so it still varied some, but not near the range it was previously. So bottom line: Definitely an improvement.