looks ok, quite heavy?
i use this one,a lot less mAh and one less port, but smaller and half the weight (i think) i think, it keeps my working phone and viewranger only phone going for about 5 days each, then it needs a few hours charging, theres so many varients around these days, theyre probably all pretty much alike.
I did a 12 day walk with it last year and charged it once on route, the bigger one might be better if you know your not going to get the chance to recharge it while out and about.
I dont think mine is quite so good now as it was though, its two years old and has had a lot of use so i canna whinge too much
i blew my first one up by putting it on charge and trying to charge a phone off it at the same time, lesson learnt
http://www.amazon.co.uk/EasyAcc-10000mAh-Brilliant-Smartphone-Bluetooth/dp/B00H9BEC8Elate edit bit
i was swithcing all phones off at night and it was fully charged at the start of the walk and nearly dead at the end