only you can decide. are you close enough to inspect it for yourself? i would want to go over and test it out. i love my viking range. they are expensive and even though mine has not had any problems, and people that i actually know in my area who have them have not had problems, i have read of problems on the internet. i just don't know if i would buy something like this used......I would rather buy something with a full warranty unless i got it at steal of a deal.

kt
If the stove is the size, color & type you are interested in you could do a little research to determine if it is worth the $.
I have a 36" AG Viking range & am very pleased - mine is 3 yrs old.
I would ask the owner if you could see the stove and make sure it is in good working order - all burners, oven, convection & broiler - Ask for orig receipt, if they don't have it - ask where the stove was purchased & contact the store to confirm date of purchase. You can also get the serial #'s from the stove & contact Viking - they would have record of any svc done. If it all cks out then I would give it serious consideration-If the owner wants more than $100 to hold the stove I would ask for a contract & that they set up an escrow acct.
Good luck

We bought a used AG Viking 36" range off craigslist-I think it is about 5 years old. It was a gamble, as it wasn't hooked up in a kitchen for us to try. The convection didn't work when we hooked it up, but it turned out to be a loose connection. For us, it was a worthwhile purchase, since we Really wanted six burners, but a new professional range that size was out of our budget. Our option buying new would have meant that we would have had to settle for a 30' range. I haven't regretted the purchase!
For us, with our large family, the six burners and the larger oven were high on our list. The solid construction is what kept us coming back to the professional ranges.

If you don't like/can't work with the brass trim, find out beforehand how much it would cost to replace it. My suspicion is that it could be costly, as many of the viking accessories and replacement parts are.