+1 Proline LGS. Lightweight, and super comfortable. Haven't used mine more than half a dozen times, but it still looks brand new. Proline definitely stepped it up this year.
I bought that because my original Ronix One would tear my calluses on a 5 day Hboat trip.
I've switched back to the Ronix handle after about 5 uses of the LG because after 5 uses or so it now will tear my hands to a bloody pulp in about 30 minutes of riding in one set.
I gotta finally throw my two cents in because other people have spoken up about it. I used an lg and the material around the handle got all bunched up and gave me terrible blisters after 2 sets. I got the A.R.I. handle from straightline and I love it because it's really stiff and never gives me blisters on those days when I ride all day.
BUY THE NEW PROLINE LGS. I got one for my bday and never had a handle so comfy and we put it thru maybe 15 hours worth of riding in 3 days. Looks brand new. I HIGHLY recommend it!
Rode a friends carbon fiber handle and loved it. Was actually a bit thicker. My current handle is a triangle shaped that came with my straight line set up. Also loved how light it was. So was thinking of a new handle. The current one has a big rip in the foam. It sinks but not sure why that matters.