You get what you pay for. It panel is light weight and efficient. It is fast to set up and seems reasonably durable.
Apart from being far more solid and well made than the others I have collected it has some whizzbang tech that really did make charging a lot less painful. Especially in lower light. The only thing missing is a direct USB or a standalone socket for a small device. However its such a nice unit I don't even mind that.
I am going to keep testing it over the next few months and will report back where necessary. But from the testing I have done I am more than happy.