Just had to tell you - I have gone mad....on Glaze pens 
Re-discovered the only one I own (black) thanks to your mania on them and was prompted (on another forum!) to try drawing free hand with it. Isn't it fabby!!
I am shading my outlines with watercolour & hope to post my efforts later.
Right, I now want the cheapest place to buy a set of these wonderful pens 