Extended battery for Dell Streak

[Guest gingerhead]

Hey, I've started this one over here: http://android.modaco.com/topic/348290-extended-batteries-from-mugen-power-for-dell-streak/page__p__1839922#entry1839922

But I'm looking for opinions on this brand. Anyone who used Mugen, post here. Please don't post about their price - I understand that they're expensive and it's obvious why. I'm more interested in performance results.