Just spent the last half hour comparing the 7 to the older models and like you say the difference is huge.My only thing is the session 5 doesn't have the hypersmooth stabilization. And honestly hands down it's a massive game changer to me. It literally means I can just take the GoPro and chest/helmet mount and get gimbal like videos that look profffesional.
Is it the 7 too big to go under the visor? I notice Mctrail Rider and Rob both mount it on the chin guard.