I have heard bad things about the solio in a couple places in that people claim it is unregulated and may damage the item you are trying to charge. But then again you hear all sorts of things on the interwebs. I've no experience with it myself.
I would also take that claim about the Solio (at least the Solio Hybrid model) with a grain of salt simply because of it’s design. The Solio Hybrid is not only a solar panel group, but is also a battery. The solar panels charge the battery, and the battery supplies power to your device. The solar panels do not power the device directly.