DE as is and SE with an adapter screw. I cannot foresee ever using a cart again personally. It's ok if someone else does if that's what works for them, but they are definitely not what works for me.
I don't have a scale to weigh it with. However holding it in one hand and the Gillette tech fat handle in the other they feel very similar in weight and very similar to the Gem baton handle with the same comparison. Although I'm not the best at this type of comparison it is a very comfortable weight to me. Here is a pic of the three for size comparison.
I lined up the top of the baton handle not the top of the screw.
Nice!!! That’s pretty much my preferred shape for any handle that is held solely by one hand. Sort of a half bead leading into a long flowing cove then fat at the end. It fits the hand perfect, giving a great spot for your thumb to rest and just enough meat for your palm to stabilize it.