The user interface of tutanoa for android has become more modern than other providers such as Ymail or G Suite.The app works very well but it may be slow at times depending upon how many messages are being sent between people using their accounts via email (such as work).
It can take up quite some space if you have lots of data stored within this service so make sure there isn't an alternative way available before signing away any personal information into their system! We use our own domain names which makes us feel like we're not giving anything back from them when they do send out newsletters etc through my contact info - I would recommend having another copy saved somewhere else just incase something happens to one account where access becomes unavailable until further notice.