Zagg sparq2.0 Portable Battery Charger---is it any good?

I just bought my iphone 4 and I must say that it uses up a lot more power than my old 3GS. Has any one used the Zagg sparq2.0 Portable Battery Charger? I friend of mine loves his for charges his iphone 4 but the reviews that I have read are not very good. Is there a good portable battery charger on the market. I use my phone a lot on the go and I would love to be able to recharge it on the go.
Any help would be greatly appreciated.
Barbara

Did you ever figure this out?   Have new 4S and same problems.  Car charger seems to work the first few times then it won't charge any longer.  Same problem with 3 different chargers and 2 different 4S phones. 
Have you found a car charger that works and doesn't burn out?

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