Finally got a low light class in which wasn't groundbreaking, but good practice. I think my biggest takeaway was for really tough shots, I like being able to put the X300U on constant on and utilize a normal grip. It didn't take much extra time but did seem to make a difference when its dark AF, the distance is 15 yards or so, its a low percentage shot, and I'm on the clock. For closer stuff the momentary worked better than I expected, but I was using the PHLSTER ARC which probably helped.