[lincpimp]

From my experience all of the maxamps packs are overrated. They also drop voltage quite a bit under load. For a 4s setup good bateries are a must. And considering maxamps prices, the trakpower packs are only 10 bucks each more expensive. Plus you can usually find a coupon on tower hobbies to give you 20bucks or so off. So the price difference is really not there.