What I found to be quite interresting and working well are the solid fuel stoves from esbit. You should be able to bring them on a flight and one small tablet lasts long enough to boil enough water for some instant ramen, soup or a cup of instant coffee.

Its gonna take some time for the apps to become more polished, the network just got a good boost in users and if the project is able to maintain those users I'm decently sure the platform will also be maturing at an accelerated rate.

We have very similar trams here, they are quite neat when they travel in their regular 10 minute interval. But once they go into night mode e.g. every 30 minutes it makes them a lot less useful further outside of the city. But thats critique on a high level, they perform really well and in 95% of cases I don't have to check a timetable to catch one to work or uni.