The nomad 7/guide 10 starter kit is goal 0's most popular product. We sell them at the store I work at and they always get good reviews, if all you are looking to do is upkeep the charge on one phone (or like device) then it is great. Ive been to tradeshows, where I have had the opportunity to see their larger kits in action and they all work flawlessly, they have kits that are capable of serving as a backup for most homes. I personally have a guide 10/ Nomad kit, and have taken it out on several occasions for extended length trips and it has yet to fail me.