Same comments as the others - BUT if you are in UK have a look at the drives on Arc Euro Trade.
With the plumeting pound, Geckos are now expensive, and at the recent Midlands engineering exhibition there was opinion that the Arc drives are as good as Gheckos, but also have better inbuilt safety protection.
I have two Gheckos and a 2.5amp one for the Z drive. I am giong to replace the Z and will probably try the Arc Euro Trade.