I don't like the fact that mod-colored tilde and pipe are missing from the base kit. Well, they are present in the Blackout kit, but this is quite expensive for just these two keys. Does not really matter for me, though, since I like Blackout better anyway (Blackout base possibly?).
And I think that R3 icon Ctrl looks bad. I get that you want to have the icon between all the other icons, but the Ctrl icon is just ugly. What about a text R3 Ctrl and those who want icons just use the Caps Lock key? Well, this is what I will do if only the icon Ctrl is available.
Lastly, thank you for including those 1.5u Stealth/Super keys!