I saw the Solio and liked it, just for the idea.
But, there are a few cons:
- it takes more than 8 hours to load in the sun.
- it takes 6 hours to load from the wall.
- it gives the iLiad about 3/4 of a charge (i only tested this twice so far)
- you need a connector from 12V to iLiad. (i used the car charger)
If you are camping with it, and have lots of sun an no alternative energy near by, it is good to use. If you also have a phone or an iPod you need to charge when you are somewhere without wallplugs, it is a good energy source.
So basically i do like the idea, it works nicely, but it is not really working for my reading habbits. But i am selling them anyway

And it probably will work alot better for the smaller readers, which can be recharged through the USB connector. That one is already in the Solio package.
If you want to write an in depth review, ill send you one to test