I hope there are a few people that have figured this machine out.

1. When washing is there a sensor that determines how clean the water is and therefore shortens or extends the wash cycle?

2. The newer models ie. 4225 have a new function "Turbo" but this model has a express cycle. is there an overall difference ?
As i can purchase the 4205 SCU with upper cutlery rack for $699 and the new model is still $1400 just one is older and discontinued.

3. A friend of mine has the G4205 SCU model and has a bit of water leftover at the bottom after each drying cycle , is this normal or should it all be getting pumped out. my concern is smell if not used for longer time.