If I bring my one and only MTB into the shop (I've already invested upwards of $5k in the thing so I'm not sure my wife will allow me to have another one any time soon) I always assume it's going to take a couple of days to get something done so I mount the roadie when I "Just gotta ride." Now, there have been cases (twice in the 5+ years that I've been riding) where the shop just took an exorbitantly long time to fix my bike. While I was understanding I was also upset and did use the "I'm a loyal customer, blah, blah, blah..." line but, in my defense, it was wholly appropriate since A) I've purchase every one of my bikes from this local chain, B) I'm on a first name basis with most of the guys from the shop closest to my house and C) I proabably spend 75% of my cycling dollars at this one local chain so I think I'm wholly justified in tossing that line out there when the situation demands it.