I've heard ppl complain about both IWG and EWG. Although it seemed the ppl with nicer EWG (Tial, HKS) have had nothing but good things to say. The ppl who complained had the Delta Mark whatever, this shitty UFO looking EWG.

And then the ppl that I've talked to that went from IWG to EWG always say there's no boost creep, nicer sound (the best part) and seemingly less lag between shifts and to get into boost (which may just be them wanting to believe that).