I bought some Atom Arc about a year ago. Bought a 10 pounder or something. I ran about 3 rods and had enough. Broke out the excaliburs I still had on the truck. Still have those Atom Arcs in the shop, under the work bench, waiting for my kids to come down and use them. I do use them to hang parts for painting, they work good for that!!
I tried some of Esabs new 7018, acclaim, out on that mechanical job. Got some sample packs. Not impressed, really didn't notice any difference or anything that would make me jump up and give up my Excaliburs.