I totally read a random assortment of both High and Twins (and occasionally Kids), because I was still in the stage of reading pretty much anything fictional and not grindingly depressing that my middle school library had. I didn't start focusing specifically on genre stuff till high school, IIRC.

I will admit that I liked them mostly because a) they were a quick read, so I could check one out and bring it back the next day (or even at the end of the day), and b) I loved goody-two-shoes characters and older sister characters as a kid, so when you pair that with the fact that the goody-two-shoes older twin had my name... yeah.