After seeing them mentioned here I bought myself a Knit-Pro crochet hook as I have a dodgy shoulder and an arthritic hand and felt something more ergonomic might help. I am distinctly underwhelmed 
I found I had to hold the hook in a funny way to build up any rhythm. I normally work with the hook just about parallel with my work but I had to hold the hook with the tip pointing towards me. If I held it like I hold my bamboo hook it caught the loops and split the yarn. I couldn't get a consistent tension and I ended up frogging it and starting again with a bamboo hook. The yarn didn't slip over the hook either.
Has anyone else had similar problems? Should I persevere? Am I doing it wrong?