I leave mine down all of the time. I only put it up if I know we're going to have a week of rain and it won't be driven or we go on vacation for a week or two. I understand what jsceash is talking about. I have four circles on my top whenever I put it up. And, I am sure the wrinkles on the sides are from leaving it down so much.
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1995 Porsche C4 Cab
2016 BMW M2, 6 Speed LBB - ED 7/2016
1997 993 Cab - Sold; 1997 993 Turbo - Sold
2001 Boxster S - Original Owner - 30K Miles -SOLD