I brought my classic as a display unit. *I have been pretty happy with it. *Just have to check that there are no obvious dents, cracks or damages to the group head, PF, filters, reservoir, drip tray and outlet pipe. *
After I set up my machine, I realised that the front two rubber legs were missing. *I email them and they sent me the parts which I replaced easily. *Other then that, no dramas.
Just made sure that they have a return policy in case it is not working well when you set it up at home. *The unit should still come with the standard 1 year warranty.
With regards to mod, if you do a search "gaggia mod" and set the post duration to a year or all post, you should see a number of posts suggesting different mod, particularly steam wand and OPV.
I hope this is of help. *:) *Enjoy your machine.
You may know this already, do get a good grinder (lots of suggestion here) and fresh beans.
PM me if necesary.