I have a platinum now and it's worth the extra money if you can stretch. Compared to the standard it's much quieter as the motor is totally submerged, easier to clean as it come apart easier and with the extra water tank, doesn't need filling so often. I don't think the filters do much so unlikely I will buy any more. just give it a good wash & rinse once a week and it's fine.
As far as I know, they are 10% off at vet UK at the moment - don't forget to buy through a rescue link so they get 5% commission. (I was lucky and got 20% off a while ago)