Google Analytics is built around traffic and acquisition. PostHog is built around what people do once they arrive, at the level of individual events and sessions. Most brands end up running both, because they answer different questions.

It ends the arguments. When a funnel shows a drop, watching ten sessions usually tells you the cause in an afternoon, and it is often something nobody would have guessed. It is the fastest way we know to find friction that analytics can only point at.

Often not, and that is worth facing honestly. Testing small changes on low traffic produces results that look real and are not. Below a certain volume, session replay and heuristic review will teach you more than experiments will.

Only if you have a specific reason, usually privacy, residency or cost at high volume. Otherwise the hosted version removes work you do not need to own. It is good that the option exists, not a reason on its own to take it.

Three to six weeks. Installing it is quick. Designing an event model that will still make sense in a year, and that everyone agrees on, is the part that determines whether the data gets used.