I'm curious about these solar chargers: http://usb.brando.com.hk/prod_detail.php?prod_id=00304 and http://usb.brando.com.hk/prod_detail.php?prod_id=00314

The whole green idea is enticing, though has anyone had any experience with these? My previous experience with the Solio Charger did not turn out well as it took two days to completely charge the battery.