Those AIOs were super popular that very first year (1996?) of E-Rate distributions to schools from the extra fees collected on U.S. phone bills.  When I was filling out the (ridiculous) paperwork to get our school some E-Rate funds, the district we were filing through gave us two choices: AIO G3s or generic Pentium PCs.

I remember the day they delivered 12 of these to our loading dock in the basement, and I got to carry them all up the stairs to my 3rd floor computer lab.  Boxed weight was ~80lbs.  Quite a workout!

I think I got 12 fruity iMacs two years later.  Much easier to lug upstairs!