What a co-incidence,
I have also got one yesterday. I have sniffed it, touched it, felt it but not yet used it (in fact I am still building the dark-room, but came across an offer I could not refuse).
I have the colour module with it, and as I understood there is no reason to get an B&W one as well.
The colour can be set such that the filter is the same red as in the B&W module, which will allow positioning B&W paper under it with the light on without exposing,
and if you use multigrade paper the filters can be used to select the correct hardness of the paper.
I did find out that these enlargers are not autofocus as is meant nowadays
(a system that focusses by itselt).
What it merily means is that the focus stays constant no matter to what height you move the head (look from the bottom into the head and you will find the cam and the follower that do the trick).
In other words, focus is manual; but has to be performed only once. (if the height of the device is set up correctly with regards to the thickness of your paper-board).
See the manual for instructions.
Mad_Boy