I just picked one up ( I do a lot of Flyfishing-walk in) and thought it would be a great alternative when I want to cut weight to my D300's. I got it with the 14-40 kit lens for $299 new. Any tips? How are they in terms of durability? Weatherproffness? I can tell write now the menu system is not intuitive. How is the dynamic range if I keep the ISO under 800? Anyone here use the 40-150 (thinking about adding one latter)?