I assumed this would a Spectrum user. How wrong I was: don't remember any Atari machines from that 80s 8-bit generation.
It certainly blew the socks off anything my Acorn Electron was capable of... .
That said, times like this are also a nightmare for third party people like software developers, accessory developers, administrators, etc... who all have to design their stuff to work on only a portion of the market or put loads of development effort into porting to more of the platforms. It is no wonder that the natural state is for most of the competitors to die off and for users to rally behind either one platform or one standard.
I don't think the Atari 600 XL and 800 XL somehow made it to France, Belgium, etc. but not to the UK.