I don't find the transformation fiddly at all. In fact I find it very quick and intuitive. Not as simple as a VF-1, but certainly far easier and less fiddly than say the YF-21 or SV-51.
Mind you, I had previous experience transforming the VF-25 model kits, before I got the DX, so was already familiar with the basic transformation and found that I didn't need to take more than a cursory glance at the DX instruction sheet before transforming the toys.
Graham