The times I've wished I had the Barz with me I've left them ashore because they have been generally useless. On rough overcast days I usually wish I had them with my yellow high def lenses. I use the gaskets with the holes, try to have them loose to allow air flow, etc. But unless I'm getting firehosed they are more pain than gain.
On the harness - do you use this version? How's the comfort around the legs and crotch?
My usual harness is a Murray's full race harness. Very good for an evening of racing around the cans, but excruciating for long legs, as the battens in the back dig into my ribs and the leg straps conspire to render me sterile. So I really need an upgrade here for Tybee.