Fisch do a good set with half sizes.Thanks for various suggestions for Brad point bits. UK drills don't do half mm sizes, Rennie don't seem to do them at all. I had rejected Rutland, £70 ish sets, but I now see a set at £25 so will go there.
I've seen one review where the user describes mounting the base with the pillar at the edge of the bench and turning the pillar 180 degrees so the only limit is the distance to the floor. Might try that one day.
The more I use it the happier I am, there are always scathing reviews but I try to read lots and see what the balance of opinion is.