Reply to Virual DJ - CDJ Skins.... Good simulation?

I play using CDJs + USB Stick only and I already have traktor 2 on my notebook, but I saw that virtal DJ has some skins for "simulating" gear s like the CDJ-2000 (which I don't have at home).
Is it a good idea to download this software with the CDJ-2000 sking to simulate the CDJ?
I mean, is it funcional? or is it purely visual?

Thanks.