I like the small size of some of the gear and have thought that having to carry less weight on the river, yet still have interchangeable lenses would be a good thing.
From what I’ve read, some of the lenses are very good as well.
Then again, a really good compact weighs even less and the zooms are pretty good these days.
I guess if I had the budget to get some of the good prime 4/3’s lenses it would be worth while, but if I was just sticking to a zoom, it might be spending much more to only get a little.
I read dpreview.com for tests on this sort of stuff – it might help you as well.
www.dsaphoto.com
A picture is thousand words that takes less than a second while a thousand words is a picture that takes a month.