Say you are the sales person.

Print out the tutorial at the bottom of this page, they may help a little:

http://www.fantom-s.info/?p=roland

take your own headphones with you. And audition all synths with same headphones, so you can compare them better.

try to put the F/S in a typical situation, as you will use it at home.

try to record a small song, resample, edit sounds etc...

don't just listen to the patches.

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live a musical life

Flaunt money. If the sales person feels they are close to a sale, they will do anything for you.

I know this isnt what your looking for but....

I still think the Live Booth Demo on the Roland website was the most impresive - He takes you through building the "Something about your Soul" song live & on the fly.

If it's still there. Yep it is, here:

http://rolandus.com/products/details.asp?CatID=8&SubCatID=36&ProdID=Fantom-S&PageMode=15

There are about five parts to it if your intrested, and you can replay them over & over to catch what he's doing..
I salivated over this for a few days awaiting the arrival of my new board.




Chris

Sit down a least an hour with the keyboard and your reference headphones. Ask for the manual just in case. (don't expect answer from the sales person about details)
Dig in the editing, sounds, sequencer, arp, sampling ect

Take your time and don't let the sales person influence your decision.

Hope you're getting a slamming deal on the FS. Otherwise I'd wait the 4-6 weeks and get the FX.