Very interesting. Are there considerations for winter storage in the North with several months of below freezing temperatures?

On Ebay I see there are several for $500 to $700. Any particular brand recommended? I saw Hayward Aquarite, The Pool Thing, Zodiac and Pentair for sale in that range.

Any caveats or raves or are they all about the same? Does one use the cell up quicker? Warranty and service support issues?