I was reluctant to purchase a printer that relied on liquid ink, thinking the ink would evaporate or be a mess when I tried to fill the ink canisters. In fact, it was so easy that I had to call HP and make sure that I'd done correctly. The ink vials have a notched opening that perectly fits the canisters - there's no way to spill the ink. The test sheet was perfect for color alignment, and we're very pleased with this printer.