Bringing spare batteries is not easy anymore (especially on US flight) and I'm using computers that don't support changing batteries anymore.

Also, as I'm mostly Y traveller, after flying with QR in Y from DOH to JFK, have to say their Y product is much better then LH product. And here are reasons why:

1. more leg space (most important thing to me), my knees weren't hitting the seat in front of me
2. their amenity kit in Y is as good as amenity kit of LH in C
3. entertainment is better then LH

I don't care too much about 2 and 3, but comfort of the seat was much better then LH Y seat (haven't flown A380) and I did lot of LH Y travel from US to EU and Asia.

Reasons why I flew QR:
had problems getting to my LH flight departing India from a third country. Wasn't LH fault, but reaching LH people in MAA was a problem, so they couldn't confirm that I'm booked on LH flight from India and the computer system had issues.