Is a DEC Rainbow PC anything to get excited about?

Somebody offered me one out of the blue, for very little, but it seems to be quite the special machine, from the tiny bit of 'research' I just did in the last 78 seconds. I know next to nothing about this machine, or these kinds of machines in general, but my gut tells me that this is a computer for a specialised type of vintage computer enthousiast.

Any general info on these machines is very much appreciated, and any push in the right direction for enthousiasts also !

Thanks in advance.

EDIT: it's a fully working 100+, so with a 10MB HDD too. It is complete with amber monitor, keyboard, floppy disks and manuals.