i am evaluating endless os (basic install, not the kitchen sink version) right now. i have bunch of soon-to-be obsolete desktops and laptops i need to find something other than windows to load. i am very impressed so far. it's nearly everything i'm looking for for these systems and their future home users.
it's nearly as 'simple' as a chromebook but is based on debian, so it can do more than chromeos. but because of the ostree base, verified flatpak applications, and simplified desktop and ui, it's a lot harder for a typical home user to 'break' than windows.
the 'full' endless install with lots of extra programs and offline content might pick up a few fans, too. parts of my area still don't have faster-than-dialup internet available.
i had been set on peppermint for the lowest spec'd systems (things like c2d 4gb/hdd) and cinnamint for the others (mostly 2nd-6th gen, 4-8gb, some have sata ssd), but endless might just end up on everything unless someone specifically requests different.