Source 4 Mini LED Dimming Performance

I saw a Source 4 Mini LED recently and was pretty impressed by how bright it gets considering the size.  I'm thinking they might well be able to replace a couple of minuettes I have lighting the approach stairs to my stage.

What I wasn't able to test at the time was how well it dims.  Xan anyone advise: do they dim nicely at the bottom end, or do they get steppy?  (Or worse, some LEDs start flashing...)  I'm assuming it's good but wasn't able to actually check...