I am going to use it in my vendetta and recoil. I'll run it on 2s in the detta for just bashing etc. and 4s for speed runs in either vehicle. The 1110 2.5D is 3700kv, which will keep me in the limit. I'll get about 55,000 rpms theoretically.
Here is a video of the ammo 3900 on 2s.(in a vendetta)
http://www.youtube.com/watch?v=RQ6k8bs9CWc
The Neu should be a little faster on 2s and blow it away on 4s.