Apart from the questionable colors, I think it appeals extremely well to the non-GMK users, mainly because of the lined F/J's - which is pretty much used by all other/regular keysets
The Extra keycap selections are pretty good too, but cyan as legends ... that's bad - if they lightened the CC alpha base to another color (a white one), I think it could have been good (as in the example photo they put in the description, which I deemed as misleading)
I'm still not sure whether I should join for a single set or not