Not to jump on you, but ...
I have spyder 2 probes that out performed my S3 probe by a wide margin. The S2 probes were closer to my spectrometer devices. That said, we then had an opportunity at the Datacolor facility to compare my S3 probe to 10 other S3 probes to test for accuracy. Turns out my S3 probe was the worst of the bunch and was tossed. The 10 others that they had varied in accuracy from "good" to "excellent." I took an "excellent" one as my replacement.
Lesson ... unless you have used a whole bunch of the same devices, saying that one's own experience with one device means that they are all like that is not good. These things are not high priced precision instruments so there will be manufacturing variance.
Sometimes you get a dog of a unit. But without the ability to see how well it compares to others, you can mistakenly conclude that the product does not work at all.
All the while, 98% of others are getting good results from it.