I have a Spyder 3 Express which works well enough (or so it seems). If I understand correctly, the more expensive versions of the Spyder only differ in the software. The hardware being essentially the same. I presume the same applies to the Spyder 4.
I remember seeing a little while ago a 3rd party program that utilised the Spyder hardware but had more detailed settings. Does anyone know if this is still around and is it any good?