Florian Höch wrote:
Another thing that may come into play: I've once read - if I recall correctly - in some photography forum that newer Spyder 3 devices could have filters that are better fitted to wide-gamut displays. Please note though that I can't confirm if this is actually true or not, so it may just be a rumor.
The Spyders have several sensors and filters (more than 3), so their spectral sensitivities can be tweaked in their calibration. If indeed different batches of devices have different filters and/or calibration targets, then (of course) ccmx files won't be usable between these different batches. Graeme Gill.