I'm a little new to the lipo thing myself, but I've tried to do a lot of research before plunging in.
Not sure about the more punch claim if a balancer is used. Are you saying that only if the cells are out of balance, thus one is not fully charged? In which case I definitetly understand. Any impact if we assume for the moment that they are balanced?
Certainly adds to safety long term. Regarding safety, until you do get a balancer, do you have a voltmeter? Well ya should anyway IMHO. If so occasionaly check the individual cell voltages, before charging and especially during the latter part of the charge cycle. Use the little port in the middle, and across to each big plug to check each of the 2 cells. DON'T let either get above 4.2 volts! And check the volts before charging, they should be damn equal. Oh, and be careful, don't short a cell by being careless with ya meter probes!
Take with a grain of salt, but what I am being told is the the cells are inherently fairly stable, which is one of the reasons we like 'em. Orion matches them, and there is only 2 of them, so they tend to stay fairly well balanced. Once they aren't, at least for semi serious and above racing they are past their prime anyway. The fly guys frequently use 6 or more cells, and that market doesn't have the history of paying for balancing. Just a lot more chances for mayhem. So then very important.
Not that I don't recommend balancing, I'm in the market myself, trying to decide if I just add charge through balancers to what I got, or start over with balance chargers. My team is expanding, Ill probably end up trying both!