I used to have it on all the time, but i notice i get this aful clunk-jerk from the rear when i brake but then have to get on the gas suddenly. Sometimes i sware i think i got a love tap in the rear by the car behind me.

so now i just use it on the freeway, but normal city driving, i'll leave it off. buuuut, my right hand just loves hovering over the button almost at all times.