in boston, city express is the bottom of the barrel. if you aren't friendly w/ a dispatcher and/or real fast: don't expect more than 20-25 tags in a 9 hour day. about half of them will clock in at an astounding $1.78 a piece.
i work for ground express now, and i break a $100+ guarantee every day without much of a problem.
if you are good at the job, the oppurtunity is there.