We have two Canon inkjet printers and have been using alternative makes of cartridges for both of them for some time with no ill effects. It's useful that although they're different models they take the same size cartridges. We also now have a Samsung colour laser printer and have invested in a kit to refill the colours on that when they need it - have already had to do this for magenta, but we were warned that the printer came with small reservoirs of colours initially. That was to encourage us to buy the full Samsung colour kit, presumably. Good points: when printing onto glossy paper for promo stuff the paper for the laser costs far, far less than a similar paper for the inkjet.

Anne