I use the Freeloader mainly for charging my mobile, so only once every 3/4 days. For this the Freeloader is great, although during the winter when there were a few cloudy days in a row I had to dig out the phone charger again (one of the reasons I got the Supercharger).
During summer, it's great, works well, just needs moving during the day round the garden as in shade the power drops dramatically. Using the 'old' version of the Freeloader battery (with the 3 LEDs), the middle one changes from green to red depending on how much charge it's getting.
Haven't tried it in the winter months yet, but hopefully a few days of even cloudy weather should give a decent charge with the Supercharger.