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Most Spyder2 sensors simply are not accurate!
As the author of likely the most extensive "Greyscale & Colour Calibration for Dummies" guide available, I thought I should chime in on my thoughts on the Spyder2 sensor vs. the other less expensive sensors out there (such as the Eye-One/i1):
In my tests and speaking with various calibration experts we've concluded that: Approximately 1/3 of Spyder2 units are very accurate. The next 1/3 are off making their use questionable. The last third are considerably more inaccurate making them useless. Unfortunately there's no way to know how your Spyder2 unit rates unless you have a known accurate colorimeter to compare it against.
The Eye-One on the other hand is consistently accurate and readings do not vary between units. Those of you that would never consider spending more than $70 on greyscale calibration may consider using the Spyder2. You may luck out. Those that want to do this right should order the Eye-One at approximately twice the price as it's the cheapest probe recommended by the pro's.
I am not affiliated in any way with Spyder or Eye-One. I'm simply a home theater enthusiast who looks for accuracy and value in equipment. The Spyder2 is certainly inexpensive but given that most units are not very accurate, it does not represent good value to me or anyone else serious about correct greyscale.
