Hi Mick, I looked at all my climbing notes and I use a climb line with spurs most of the time . A climb line on the tree itself or a tree close by and spurs and a flip line. I started as a rec climber and when I trained/practiced with spurs, I was using a backup rope. After that, I stuck with the rope and spur combo. It feels very weird to not have the rope. As I get better sending a throw line, the time spent setting up the climb line gets shorter and shorter. I find that the main drawback of climbing with spikes and a climb line is the potential to spike the line. I am getting better at avoiding this situation as well. Lastly, with an ash which bark has been lifted by woodpeckers, there is not much to spike into.