Inphinity: *shrug* Chorus were great for us. Ordered fibre, got given a date ~2 weeks later, guy turns up, couple hours later fibre is on and working and hasn't missed a beat since. They had to do some traffic management consent etc and it was all smooth as.
My install went relatively smoothly too; there was a delay of a couple of days but that's because my underground install was deemed "too hard" and had to be switched to overhead... and the original build team hadn't put the necessary equipment on the pole so there was a delay while that was done.
Once those problems were sorted, the actual installation only took half a day.