Hi again,
Re cracking and appearance of polished concrete. Onc has pretty much finished, our polishing (just some final buffing and wet area polishing to do), but the finish is just amazing. When he was polishing (its covered with corflute now) you could see the reflection of the landscape and sky on it). In 350m2 thats polished there are zero cracks. There are a couple of small surface fissures in the kitchen.
I strongly believe that it comes down to using quality trades. I would never use a sub contractor to lay slab and then use someone else to polish. A one stop shop is the way to go.