As a Helsinki resident (and Whim user) it’s important to point out that while the user base of Whim has grown quite a bit, it’s most likely due to the introductory price that won’t last forever. For 49 € you get public transport, public bike (first half an hour free), cheap taxi rides and perhaps slightly cheaper car renting, whereas to get public transport alone without this app is around 55 €. So I wouldn’t call it…
HSL are also working on a monthly API I believe so I suspect the hassle of having to buy a ticket each time through Whim will soon disappear.
The car rental is not particularly cheap. Have you had any experience with that yet?