The first cartridge I opened and installed (yellow) with no problems. But every cartridge I've opened since (cyan, magenta, black) has leaked heavily after removing the tape, making installation and use impossible. So my guess is that this issue is due to a bad build at some point. As only 1 of the 5 cartridges I bought was usable, this product is definitely not worth the price or the hassle - the leaks resulted in a huge amount of ink that needed cleaning :(