I have the Hydroforce Olympus 1200 which was the first machine they made before using the advance platform.
I cant fault our model. It has given us great service for years.
They are heavy due to the big pump motor. The Advance even more so if its the triple vac variant.
There are other ways to do tile & grout cleaning. I would only consider this machine if you already have a good rotary and wet vac set up and are looking to tackle specific situations.
We do poolside maintenance so for this the SX-12 and Olympus are perfect and the Health & Safety people love the fact if someone falls in the pool the worst that will happen is that they get wet and it will suck up some of the water unlike a rotary or wet vac that will give them a bit of a tickle (we use 100volt kit for this). The waste is also pumped to drain so doesn't spill back into the pool system which is another tick.