Jönköpings Länstrafik AB Reviews 

You can buy a train ticket for the next day via the jlt app but the ticket is only valid for two hours from the time of purchase. Which means you can effectively not use it at the intended time (next day).
When calling the customer service and asking them for a solution in goodwill, all you hear is you have accepted their T&Cs when you downloaded the app and they can't help you.
They should not make it possible to buy a ticket for any other timeframe than what it's valid for!

Incredibly bad. The busses often go much earlier than their scheduled time shown in the app, so although i come to the busstops on time, i have to wait for the next bus, which can be after 20 minutes because of the terrible schedules for some bus routes.