Same day service - the garage door works again!
I had a coil spring broken and as a result my only choice was to help the door open by lifting manually, and to hold it on closing.
I emailed them early in the morning and got a call back soon and agreed on the 4-8 pm time slot. They called in advance and showed up a bit early at 3:30, which was still Ok.
I was offered the option to replace only the broken spring or both - there was no pressure, I choose both as my other spring was a bit rusty after 15 years of lifting.
The job was completed in a reasonable amount of time (under 1h), and the price was reasonable I guess. The door still works nicely after 2 weeks, so I guess they earned their 5 stars.