We don't have slide toppers (yet) and are still considering whether to get them or not. So I can not offer anything but more "confusion" about whether they're worth it or not since I haven't got the answer for myself yet either....
But as for rain runoff, I've see a lot of people use a beach ball, one of the rubber kid's balls from WalMart that sell for $2.00 stacked in the center aisle and also swimming pool cover pillows. Any of those would work to prop up the center of the cover just enough to change the dip to help with runoff.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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