The characteristic of this ink that makes me hesitate the most when picking it up to use is the ink flow and lubrication. More than 90% of the inks I use are either in the middle of the scale for flow and lubrication, and I tend to like inks better if they are well-lubricated and flow easily. With Petrichor, it feels like ink supply is constricted even on pens that usually have no problem delivering lots of ink to the page. This also makes the nib feel a little dry when writing, which constantly makes me stop and think that I might have an ink flow problem. No, the ink is flowing just fine; it's just the ink formula is on the dry side and doesn't provide the amount of lubrication I like for writing. That's not to say it's a bad characteristic, but it is one that you should be aware of. If you want a dry ink with very controlled flow, this is great. If you want easy flow and a glossy feel when writing, this isn't for you.
The ink behaves well on paper. I haven't noticed any feathering or bleeding, and it starts right away. It's also easy to clean out of pens with just a water flush. I haven't experienced any weirdness with long-term storage in a pen either (meaning, no weird crusty build-up or other residue on the nib after it isn't used for a few days).