The /arsenal set is ok... on paper. Making Elbow Strike and AoE hit would make me want to take it. Trip Mine is just silly and should be removed as it doesn't feel like an assault type power - give me Flamethrower or another ST shot instead.
I'm pleased with the control set, although I tend to respec out sleeps for late level content as they become next to useless with all of the AoEs going off.