I think it's indeed amazing that they bring something like this out, but only for the collector. If I have several handheld consoles which can play all the games I want, why would I need this. Pure nostalgia all the way.
I still have one keychain mini game & watch, friend from work brought it for me when he was in Japan.
But I still have very fond memories playing on those in the early 80s as a kid, that was amazing at that time, and there was nothing else yet, I mean portable.