Do it! You won't be sorry... Anyone running a 3S lipo NEEDS this (or a comparable) mod.
I'm really curious to see how long the dual motors last. Before, after about 3 or 4 flights, I could tell the motor was starting to get weak. By the 10th. flight, it would barely run any longer. The dual motors still feel exactly the same as the day I put them in, and they have about 5 flights on them now...
When I did this mod, longevity was really my only goal, but I have found that the performance boost is awesome! I would hate to have to go back to a single motor tail now. I doubt I could hold it steady after being spoiled by the dual