Coming from a gen 1 Kask Protone. Got the MET for MIPS technology and to have a new look over the old Protone in a semi-aero design. Overall I love the Manta. The Fidlock took a little getting used to but now I love it and it's easier to disconnect one-handed vs a traditional clasp. The sizing was spot-on, running a touch larger than the Protone in the size medium I went with with my 58cm head. Ventilation is not bad but probably a step behind the Protone. However the Manta is better at not channeling the sweat straight to your eyes and sunglasses like the Protone liked to do. Only real detractor of the Manta is that it is harder to get my sunglasses in the sunglass ports with one hand than it was with the Protone. Other than that, I think I like the manta better in every way.
