I'm seriously looking at the Pico XEUS. It seems the best option for me when considering price, runtime and dimensions. The build quality and technology seems sound, and most of their claims are good except one, where they state that the lights have the "potential to last forever". Supercapacitor capacity fades over time, and after about 10 years it is down to about 80%. I would sure like to see a warranty on their products, but I can't find any mention of one.