If like me you have a HP Photosmart C410 then look elsewhere. I have been buying originals, and some other higehr priced compatibles. I saw the price of these and thought it was worth a go. I have spent a lot of time trying to clean heads/alter settings/printing test pages etc. I would have been better off just buying another set of my previous compatibles.
I can see why some people give these a good rating - the price is excellent. There is no grey area though (yeah I do colour printing puns!), they either work or they do not, and for me they do not so are a waste of time and money.