I don't think this thing is void of any value. I picked up one up simply because I am mad for all things Neo. It's just OK, nothing great. I think expectations were over the top for it, but I guess that's because it had the SNK name on it. But as GohanX said, there are better options for playing emulated Neo on your TV at this point. So it really is just kind of a collector's item, I guess.
If you want genuine Neo action, but on a budget, the CD is your best bet. However, the load times are atrocious for some of the games, and later titles were never released.