none whatsoever unless they happen to be lighter, they just look miles better!

by the way theres a place between my place and weston that can supply real nice quality 3mm polycarb. cost me just under £80 for enough to do the fiesta iirc. which is less than what the shite stuff B&Q sell wouldve costed. i struggled to find 3mm, everywhere before them i looked only did 4mm and 2mm, 4mm being too thick and heavy, 2mm being way to flimsy. i have their business card still if you want thier number.