So being a 80's kid, i had one of these and it was my pride and joy. Spent every moment i had on it, well, when it wasn't loading of course. Anyone born in the 90's won't understand but this computer loaded the games from audio cassettes (or disk drives if you were lucky enough), so you had time to make a cup of tea, maybe some toast because you knew full well you were going to be on it for the long haul.
So what was special about it?? Well the amount of games was paramount on the list of positives, and also the fact that most of your friends had one too (unless you were talking later on when people starting getting Amiga's and Atari ST's), so you could swap games with ease. Bad points - Having only one TV in the house was a bad situation because you had to wait till your parents had finished watching whatever they'd be watching first. Obviously the loading time was a major downer too.
Best games - Jet Set Willy, Beach Head, Steve Davis Snooker, Ghostbusters and Trap door (probably). Missed loads out because i had loads of favourite games but i've added most to my games list that i've played if you want to browse.