Tonight's poor storm was my first chance to play with it, while battling light pollution and trying to balance exposure times against what the lightning needs with exposure. In hindsight should have opened the shutter more and taken shorter shots. Oh well, live and learn.
I agree, the focus is the hard part. Infinity on my lens isn't quite at the end for manual focus (not sure what I should be focussing on past infinity but anyway). Tonight I used a distant streetlight to set the focus, though this could be a problem if I was trying shots out in the country with nothing to focus on.