Can be buggy at times. There are alternatives to it like Make for example, which allows you to do much more. But it also requires more tech knowledge.
Zapier is very user friendly, you don't have to be tech-savvy to automate your routine with it.
Not much to say. Everyone who uses it knows there's simply no alternative to it. Superb! Now that they also launched tools for project management (all in one template) it's even better