Goeff I did one of these in 2011 and have been really pleased with the result. It makes work on the car so easy.
MaxJax Reviews -US
My slab was all concrete with no filler and quite thick enough. More than needed really. I used a large impact drill set that I have to make the holes. I also sent lots of time measuring ... Just be sure you don't hit the reinforcing rods. That can twist you, instead of the drill bit! The MaxJax has a quite large base and spreads the load well. The anchor bolts are most impressive and I couldn't find any bad reports on them. I have had a quite a few cars up on the hoist with no problems. 150mm is fine.
The agent is in Tingalpa and is very helpful. They have a large base in the US as well.