Late A preferences--a survey

What do you like/dislike about each generation of later As? (parts availability, quality, styling, performance, etc.)
Supposing that they might naturally divide into these subsets...

'67-69
'70-72
'73-76

From what I've gleaned from this forum, there are those that feel quality control took an upturn in '70 and '71. At any rate, sound off on it. I'm eager to see what everyone thinks! Also, if '73-76 are called "beaks," who has names for the other two subsets?