I am a Student and you know what it's like trying to find a Chair in the Lecture Theatre next to a (Cleaners Only...) Power Socket. As I have a MacBook Pro, I have to say that normally the internal battery is more than enough for a good couple of lectures....but for an extended day in the cafe...doing group work etc....this gives me hours more...
It also charges my phone at the same time...no need for two chargers now...
My one niggle was that it would charge my iPod Touch (2nd Gen). I spoke to Power Traveller and they sent me different tips for the iPod free of charge for the next morning...These sadly didn't work, but I have spoken to Apple and they think it might be a fault with my iPod Touch...so not the Gorilla's fault!! And it demonstrated that Power Traveller have first rate Customer Service support...
FURTHER NOTE on iPod Touch 2nd Generation...I have been to visit Power Traveller as they are nearby and I was invited to sort out my charging issue in person. The Service was incredible...The new Power Gorilla has been updated to allow charging on the iPod Touch (Apple have tweaked the charging voltage on some of them). It now charges like a dream....If only all Customer Service were this good!!
So in summary, if you're looking for a really handy boost to your power for all sorts of gadgets, this product and the manufacturer come A1 recommended by me...