I need a winter cover (12 X 24 AGP). What are your thoughts on the solid vs micro-mesh. My understanding is that the mesh style allows rainwater and melting snow through to the pool. Is this a good thing??? I also noticed in the pool school winterizing article it says: "If using a winter cover, install per manufacturers instructions." Are covers optional? Why would you not cover the pool??? This is my first winter, so I have no experience at all.