I bought a pair of Rainlegs not long ago, and used them for the second time last night. Possibly expensive for what they are (£24.95 from Townsends), but I really don't like overtrousers and they do stop trousers getting as soggy as they otherwise might when raining (and are smaller and lighter in a bag). (I'm not sure they'd be as much using walking or running, at least if the wind was behind you.)