Well I bought OS3.5 and OS3.9.
annoying things in 3.5 : time limited tcp/ip stack (miami), Aweb SE so I registered both
annoying things in 3.9 : movie player not supporting current file format
Of course there are much more but these were what I was expecting.
Is it worth ? maybe not if you already have a fully functionnal TCP/IP, web browser and movie player.
Lio