I have the F62 for about a year now. There have been no issues so far and it’s really pleasant to type on. The only thing I don’t really like are the stabilizers of the left shift and the enter key, specifically the lack of actual stabilizers. At least on my unit, these keys are not exactly smooth.
I have never used Öffi myself (always had an iPhone), but have you tried ÖPNV Navigator? It seems to provide similar functionality.