Put simply, with my HP printer I've always had problems with compatibles, using more ink per page, gumming up the machine, even declaring 'empty' whilst ink is still sloshing around inside. Pay the extra and save money by not having to stop work to repair your machine!
I do think you get what you pay for with most things and I have never had a problem with a genuine cartridge which is more than I can say for the alternative ones. Note that the 'large' cartridge has about twice the ink of a standard one
Alway difficult find the best value cartriges because of complicated way that HP offer their cartriges. I always used Hp and never similar compatible cartides. This company offers excellent service and I never have a problem with them.