Availability check is not really meaningful. With us, 100 is possible, in the end only 25. And Telekom calls that fast ^^. They told us directly during the technical check that only 25 MBit would work, which we are now consistently getting.
The values from the check will probably be correct. They postponed our technician appointment twice without reasons. The first appointment was scheduled with me, the following ones were just set with a time window from 8:00 to 17:00. Very work-friendly. In the end, it turned out that no technician had to come at all. If I had taken time off work for that, I would have been really angry. So things don't really run smoothly at that company, but that was just minor stuff; financially and with the connection, it worked out.