The guy from the shop must really like you. Its a lot of work to get those inserts installed, (I have done a few myself) I think that the best thing you can do is after about thirty miles is go in and have the shop do a real tune up on that bike. After a few miles all of the parts that can will "creep" a bit and your cables and spokes and such will need to be adjusted. Its when a bike will tear itself to bits if it not "set" correctly.
When I used to sell brand name bikes I would give thirty days free service and two tune ups when you bought a new bike from me. I did not make any money on the bikes but I sold a bunch of gel saddles. and other stuff. That way I can help set the bike up for what the customer wants to do with the bike.
Its really important that your body is "fit" to your bike. If your off by a quarter of an inch in the seat post height you can do permanent damage to your knees. If all else fails than I guess you can try to match your old ride (if it was set up right)
Anyway good luck and now its time to start working on just wearing that new one out.
Mike Frye A.K.A. Frye Bikes