I have an SL and I like it a lot. For small work it is very handy to be able to pull it out of the shelf where it is stored, plonk it on the desk, plug in and go. I've even taken it out and about on occasions.
I fitted mine with an ER16 collet holder which gets used for almost every job on the lathe. The M12 x 1mm spindle thread does indeed make it tricky to source attachments – I used an ARC Euro holder but needed to resort to using another lathe to make a backplate.
There is a set of pictures on Flickr from a chap who made an ER16 holder almost entirely on the Unimat with a very neat trick for cutting the threads.
https://www.flickr.com/photos/65657096@N00/albums/72157632104757918
Or one can be had from these folks… but that loses the advantage of machining the holder on the spindle where it will eventually be used.
https://www.rcm-machines.com/en/chuck-er/collet-chuck-er16-with-m12-x-1-inside-thread/rcm12er16
Good luck with your Unimat!
Regards, Andy