Yes the later Microbees were pretty powerful machines in their days. Easy to use with their Graphical Shell, etc. with ZCPR 2 version of CP/M. There is an un-official CP/M ver 3 for the Microbee as well. Pity the cheap Taiwanese IBM clones killed off all the non-msdos 8/16bit PC's of the day.
Arr the Amstrad 6128. A friend at the time had one of those and with the non-standard 3" (not 3.5") floppies he was unable to get a lot of software. I remember he was desperate for Wordstar 4 at the time but was simply unavailable for the Amstrad. So I took my Microbee into work, he his 6128, a bit of telephone wire and a couple of serial plugs and transferred it from my 'Bee to his Amstrad at 300baud. The 'Bee could transfer as high at 19kbaud but the link was limited to what he could get to run on the Amstrad at the time, ie 300. Took about 7 hours !! but he was over the moon
He then bought a 5.25" Floppy external drive for the 6128 and I ended up working out the Amstrad floppy disk format and added the data to Setdisk. I was then able to read/write and even format his 5.25" Amstrad disks in my Microbee. All good fun in the mid 80's