I have now 3 orders completed with Supreme Shower Screens.
First 2 fantastic experience from the beginning to the end:
1. Framed sliding shower doors. Job completed in 4 days ! When they called that they are coming to install It I was pretty sure this was a mistake. But it wasn't - they really completed the order in 4 days.
2. Two sets of double wardrobe doors. Job completed within a week.

The third one was not that great. It was semi-frameless shower screen. Their policy statement says it should be completed within 2 weeks/10 working days. Kerry said the same. After 2 weeks I called to follow up on my order. Was told they will come in 2 days, but they didn't. I called again and they apologised that they don't have installers in the area. Finally they completed the job within 3 weeks.

In all cases the measuring process went smoothly. Kerry was the person doing the measurement all 3 times. Honestly very professional and friendly.
The installers were also great : 3 different installers for 3 different jobs.
So what went wrong the third time : I think that the scheduler - the person who organises and schedules jobs. And my expectation. Because they have done such a fantastic job twice I expected the same the third time.
What should have happened. Someone should have given me a call at the end of two weeks and explain the situation - in other words manage the expectation.

I still would have given them 4.5 stars but there are no halves.

Approximate cost: $2000