It can be awesome, or it can make you a target to be eliminated early, because they now know where the gun is.
It does make dressing easier if you aren't trying to hide it. Open carry is legal here in Georgia, but the only time I open carry is at the range, or when hunting or fishing.
I've got Glocks of various sizes to help with concealment for different weather. I'm not a realy big guy so, larger guns can be harder to conceal.
I'll be transfering to Washington soon. Weather is a bit more suited to concealed carry of larger guns there. It is an open carry state though as long as you have the liscense. It's a shall issue state as well so, that shouldn't be an issue. More liberals out there than here in GA, so it may not be as socially acceptable, (not that I really care, but it only takes one screamer to bring more attention to you than you want.)
I'd rather carry concealed and have the option to open carry, than I think I would actually like to open carry that often.
What ever works for you though.