I dont find it rough as such, just unbearably painful. There's no headbanging on any of that nonsense, so I wouldn't call it rough at all.
The trains just seems to jolt at the bottom of each element, feels like a violent shake and it hurts, real bad, and I mean real bad. My first ride early on in the day was on the right, and it was painful, and my last go later on in the afternoon was on the left side, and it was death incarnate basically.
Its definitely unusual as I've never experienced anything like it before, especially on a new (ish) coaster.