I'm not sure, 2nd gear on it still has a fair bit of go in it. But then it's all geared down so hard to say.
Low end and reverse is ultra smooth though, it's definitely worth the upgrade. If I built another I'd go for the 2200kv though, bit more money but even slower and smoother on the throttle.
I'm thinking of trying the fusion Se as I find my stock set up a tad jerky. Especially the reverse.
Did you gain any top speed?