They weren't perfectly balanced when I got them. But they balance charged very well. And they stay balanced well since first charge. I currently have 10 runs on them with an erevo 2.0. They last about 40ish minutes with the way I run it. I'd say 15-20 with harsher use. They have lots of punch. It makes the revo wheelie with ease until LVC. Which is quite impressive being on 4S (two 2S).
I would probably buy these again. Considering they are priced well, are punchy, and give good run times.