I tried 5S...wow.

nice one!! for each cell u could really tell the diff ey?

i could really tell the difference because i've always upgraded by even numbers =]
started of with 2s then 4s n now 6s just to see the difference in my revo.. but now i really wanna double it to 12s... which i'm still researching every bit of it =]

P.S Why don't u upgrade another cell to 6? So your "WOW" becomes "OH MY F***ING GOD!!!" hehehe =]