Very nice. Defeated me.

well done. I especially liked the category containing Detroit

I especially did not like that one. Obscure musical references are always a bad idea, because not everybody is into music, and, of those who are, not all will like a particular group, and even if they do, they may not be sufficiently expert as to get such connections. A good grid is one which could be got by anybody with a good enough general knowledge.

Couldn't get the egg group. Despite saying to myself "they are all things you can ..." Can't complain, fun grid.

Nicely done, medium hard to solve. Well thought out

Brilliant.