I repaired 2 of my MacBooks during the last couple of years - one had a butterfly keyboard issue and another had a swallen battery. Both times it took 1-2 days and both times their support was amazing. The best part of it - both times I did not pay a cent for the repairs, it was all known issues. In the swallen battery case they replaced a keyboard and the touchpad module as well, and the laptop was not even under warranty anymore.

I guess my case is a bit different from yours, but I was very satisfied with their technical competence as well. I suppose it depends on the country in the end, in my case it was Singapore.