I bought a 250 watt and its not bad , works ok . bit heavy but I wanted the 250w , they now have a 200w folding thin panel packs down to about 500 x 500
I have the 160kw panels and the seem to work very good. I don't use a lot of power but my old 105 amp battery was kept charged for 2 weeks camping in the bush.
Ditto to what Bello said, I have the Kings 160w panels and on cloudy days they work fairly well to supplement the 600w I have on the roof (feeding 460a/h of batteries). Only thing is the weight - mine tip the scales at 14kg.
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Hino Rainbow motorhome conversion towing a Daihatsu Terios