questions about Allpowers 10W 5V solar charger vs the 21W 5V version

Hi, has anyone observed if the 10W version also has the immediate charge restart function of the 21W version? Right now i can get one unit for less than half the price while it puts out 1.6A, verified by a few users. A no brainer considering the latter version only does 2.1A at the very best. Someone on a retail website also said he only got 3V out of the 10W version and a respondent said to check if it had 12 strips across each cell for authenticity. Has anyone encountered fakes?