Rode with this one this summer, DH and also on my m bike. The fit is perfect for me, no obstruction or arm bothering me when I ride. The back-protector wasn't too bulky and stayed on nicely. Took a few diggers especially 1 big one in DH and a good one on my mx bike and in both case, nothing. Very breathable.
I would maybe want one of those new Thorax chest-protector that they do but this one did its job already.
Good product. Happy to go another season with this one.