He's a little bulky as an arm, especially compared to Blades (probably the slimmest CW deluxe so far) but otherwisw I've got no issues with him.
If you have his backpack like in robot mode then just angle the arms back towards it you can get a slimmer arm mode. Much better than the stock transformation.
I think this is my fav of the Portectbot limbs; the blockiness is a nice contrast to Blades, and I love the head sculpt and ankle tilts! A very good DLX figure.