I have had a 20G Launch Edition (single trigger, automatic opening straight grip, exhibition wood, color case hardened) for probably about 7 years now. Overall very nice quality, and at used pricing I would say it is an exceptional value for money. Here are some observations about my gun, the one you are looking at could of course differ:
Pros:
Gorgeous wood.
Exceptional case coloring, some of the best I've seen in real life (as opposed to pictures).
Very nice, traditional style luggage case.
Light, small, nice to carry.
Auto opener opens fast and easy.
No warning labels engraved into the gun. Big plus I think.
Cons:
The choke tubes tend to come loose very quickly, within 20 rounds you have to snug them down. The unique "friction" fit supplied tool (not toothed like on say a Browning or Beretta) and doesn't work very well.
Because of the automatic opener, it is hard to close. Kind of a mixed bag with the opener. I left it in because it was a very expensive option, and is unique at the price point of this gun when new.
It has a swamped rib, which has a clean and British look, but for me is harder to shoot well than my other S x S with a slightly raised rib. This is a personal problem.