Well after a few days with speedskim I must say that I really do like them. I use them for flattening off after the 1st and 2nd coat and no waiting for the materials to pull in. I have used the 600, 1200 & 1800 and it feels much better to me than having to flatten off with your trowel. I have also had a go with a speedskim spat, the 1st time I have used a spat by the way. Yet again I must say that the overall appearance of my work looked much flatter and more importantly than that it was much, much easier.
If you are struggling to use the speedskims, have a read at the instruction manual, I think that its on their website. I for one will use them whenever I get the chance.