I try my hardest to keep a good "look-out", as I fly day/vfr with no funny gadgets that take lots of head in time, I think I'm quite proficient. I generally wing rock or roll to draw attention to myself.
Somebody yesterday in a westbound C152 just north of Marham at 3500', about 1535 saw me and wing rocked in response to my wing rocks - I was too cold to roll!