Bub,

I totally agree with why you are doing this. If you plan to purchase something like this then the ONLY way to decide if you want it is to demo it within your own system.

After all you know the quirks/benefits of your setup/listening.

If you were buying a car you would want a test drive - take it out for an hour or a day around roads you are familiar with to get a feel for road handling etc.. You wouldn't just go around the dealer's parking lot for 5 mins. Why should hifi be any different ?

If you are willing to have it on sale or return, and so is the dealer, then this is the only way to demo equipment.