I got the hf5's for their sound and isolation. Sound is great. I can only get great isolation with the gliders if I go really deep. I can get slightly less isolation with the foam's. The triple flange provides zero isolation on both, no matter how deep. Even with the best isolation of the etymotic I still could use more. On the subway I can still hear most things.
I am considering doing the custom fit tips. I just don't know how good the isolation would be with the custom moulds, does anybody have an idea?