worth

As per title really?? I'll be in the market for some Michelin PS3's soon for the E320 and being as Costco only sell Michelin tyres was wondering if the annual membership could be a good move being as the total tyre bill could be around £800? :thumb:

What are people's experiences of using something marketed as a "wheel wax"? Is this different from any other kind of wax/sealant? I've had a bottle of Mer Wheel Wax for a while (don't know how or why as I never usually buy Mer products), which does not seem particularly impressive or durable...