Buy it!!
I have one in 16ga over .222rem. It is an excellent small game combo, I like them much more than the Savage combos. They are designed nice and slim, balanced well with good iron sights. They do not have a hammer or a safety, to #### the gun you must fully swing the opening lever in the opposite direction, interesting. The barrel selector is a slide on the side of the receiver.
As for value, $400 to $650 tops. As stated above, Trade-Ex gets them in at times and they list them for $500 and under.
If it is in great shape, I would give up to $600, but $450 would be plenty to offer. They are very under rated in my opinion.
If you don't take it, let me know, pm me if you have any more questions.