"Read" the first 5.
I didn't know that the first volume had (almost) no censorship, and the others only have very light censorship. It makes a huge difference compared to what's released these days.
As for the art I find it extremely dated and often quite bad.
Chapters that caught my eye:
Vol. 1: The ones starting on pages 137 and 217 were cute
Vol. 2 to 5: Shiawase 1500 once again proves he's an underrated master. I didn't like his chapter in vol.5 that much but the other ones were quite good. His technique definitely improved since but he managed to keep his style intact.
Favorite cover so far is the one from the first volume. >>2418
There's a 30-something Gigs torrent on sukebei >>2393>>2395
My Japanese is extremely bad so it's more about doing a quick first pass through the book and then concentrating on the chapters I liked.