I usually prefer converters + bottled ink, but when travelling and otherwise unable to safely carry around a bottle of ink, cartridges are the way to go.
Using these cartridges in my Lamy Safari with a 1.1 italic nib, I can say that this ink has fairly good flow, nice shading, and behaves very well on low-quality paper (little in the way of feathering or bleedthrough), which is a big plus. Lamy cartridges are also huge; one will last quite a while.
Removed one star for the colour: while it's by no means bad, it's nothing special, either. I have a soft spot for green inks, but this one's a little weak and watery. At least this means it should be easy to clean out of the pen. Still a much more fun alternative to Lamy Blue or Black, though.