It will improve punch and it'll also ensure that the batteries last longer. A guy at our club recently got a equalizer. He's the kind of that always buy the best, he can get. He got matched Orion cells - he was quite surprised with the equalizer...
Some of the best are the Rayspeed and the
Indi SP Saddle Relay Cut-off Discharger 5A . The Novak is also good, but too expensive at my opinion, compared with the before mentioned; Basically, they do the same.
For budget guys like me, the
Robitronic is very good: AUto cut off at 0,8 volt, 1 amp discharge rate and control LED's to ensure all batteries have contact. The price is 30 euro. I dont think Robitronic is represented on the US market, but you can either order it from Europe or find something similar elsewhere.