Going on vacation soon and anticipate using my phone a lot for various apps during the day, while away from any outlet. I am looking at the Brookstone Quick Charge and the Zagg Sparq. I have seen one thread about the Sparq, and apparently the jury is still out for him. Any other experience? At a glance, the Zagg is slightly larger/heavier (will be carrying it in my bag all day) but appears to provide more charge. Would appreciate any actual user input though. Thanks!