I've never seen a series 2 surface, I don't know why. This one is a few years old. The price has dropped to the point where there's not much point in buying anything else if your goal is to just to play the games on the real hardware with no concern for collecting original carts/kits.
There was a similar abandonment of the CPS1 14-in-1. At the time I bought it I almost had their second series CPS1 16-in-1 locked./paid for which had rare undumped versions of Punisher etc. but they gave up on production before I could close the sale. Literally canceled my order and sent me an email saying there were bugs they couldn't fix. Maybe that is what happened with series 2. It started acting like a pain in the ass and they couldn't justify keeping trying to make it.