For ET-1: The charger is well verabeitet and loads connected devices right fix. With a 2000mAh battery which is also not difficult;) The solar panel is a bit weak, but that does not bother me. It takes just under 24 in the blazing sun to the charger - fully charge the battery. But this is also via USB and needs since only just under 4 hours.
For Service: My ET-1 was not the iPhone 3GS 32Gb. I Energy Trends thereupon sent an e-mail that were answered within 2-3 hours. Meanwhile (strictly speaking a day later, after I sent a mail Tricad) runs the ET-1 perfectly with my iPhone.