Even new tyres do not completely eliminate the risk of aquaplaning or slush planing, but it is possible to control the car as long as you adjust the driving speed to the conditions.
The clear winner in the A-Class at the moment appears to be the Lotus Exige '06, which is a mid-engine rear-wheel drive car that started just within the confines of A-class with a PI of 510. Everyone who has ever owned a car will understand what a huge relief that would be in terms of car maintenance.