I currently have 2 T17 (both heroic) and 2 T18 pieces. Considering replacing my 2 T16 pieces with itens of higher ilvl - a 695 chest and a 705 legs, both with sockets. Stats of that itens are a bit inferior, would lose some haste and gain some multistrike, but they have sockets. Should I switch then? I play CoP. Honestly I never liked that T17 2 piece bonus.