Use Zoom H4N all the time. Connect it to a boom mic too on occasion though this wrecks the batteries very quickly.
Easy files transfer, great sound quality. Captures wide sound sources with the angled rotational mic heads.
Alleged rugged design, though I did break one of them by dropping it from a small height and cracking one of the flimsy metal condenser mics at the top. It was fixable.
They're pretty cheap nowadays.