Wasn't even planning to come but my colleague wouldn't stop raving about BuyPower so I finally tried it last week during my lunch break. The electricity payment went through fast and without stress which is honestly what you need when you just want to sort your bills quickly. My only gripe though is that the app interface is confusing for no reason like why is everything not where you'd expect it to be. Overall it does what it's supposed to do and that's really what matters.
