Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Utterly useless. A quality-control nightmare.

I'm normally not so negative on a product, but this really is one of the worst I've used. No matter what I did, my MacBook Pro and Apple 23" Cinema Display ended up looking pinkish/brown. I've read numerous reports of this, but still took the plunge. I've also read of people getting slightly different results between identical Hueys, so clearly this device is not being tested correctly. In any case, the product may in fact work if you get a GOOD one, but since that's a risk nobody wants to take, there's no possible way to recommend this device. I since bought a Spyder2 and have had nothing but joy from it.Stay away.