Powerfilm Solar Charger

I have 2 of their 60W foldable panels, they are very compact and fold into the size of an A4 page about 25mm thick.
I have only used them a few times and have no long term experience with them. They can be connected in parallel directly without any fancy electronics.
I had them delivered to my door from the US for about $710 each from buysolargadgets.com

I dont know where Engel get the efficiency argument from.
On the power to size ratio the thinfilm technology solar arrays are somewhat less efficient than the common silicon arrays although they hold great promise that many manufacturers are trying to achieve.
On the power to price ratio thinfilm is a lot less efficient than silicon cells. When I spoke with Engel at the Sydney camping show their 60w panel cost around $1000.
I did also see a good 'packaging' system for traditional silicon cells used by the scouts (I think). They used a number of 10 or 20w arrays sewn into a sheet of canvas. The glass arrays were about 30cm square and so the whole thing could be folded down into a brick of approx 30cm square by 10cm thick.