hiya,
I got my car signed just over a year ago and it has brought me a few new clients, its not just that though - it advertises your name and the more people see your car around the more that name will stick in their minds so if they then at some point need your services and go to look you up- say in the phone book, they will see your name again and will remember you. It makes an impression on people and shows them you are serious and proffessional.
The downside to it is that if you're anything like me and sometimes get in a tiddle when people almost crash into you on the road - your name and number is all over your car and someone who may pass after the other person has almost wiped you out wont have seen the reason your so annoyed! lol! (Ive been hit a few times by some very irresponsible drivers and almost wiped out by haulage lorry who decided to take a turning at the last second without checking his mirror first - so you can imagine how calm one was!!)
I do find sometimes that I feel a little paranoid driving aorund with my logo all over my car, feel that Ive always got to look my best - even when I feel like poo! I always find people stop me in the car park after ive hard a hard days shopping and look like ive never slept! Funny enough - those are the ones who dont seem to call me!
So there are good sides and bad sides to it. To be honest, I think when I get a new car I wont be getting it signed. I might get magnets instead though that I can out on just when im working..