Well, I don't have a Tekno Neu, but I just received my Castle Neu and wow I'm impressed! :D Running the same 4s2p A123 packs in my ST-RR with 15/50 gearing, the CC Neu doesn't even get above ambient temp.

In comparison to my 2084kv Feigao 8XL which was getting up to 60 degrees Celcius in about 2 minutes at this setup.

I expected the CC Neu to be better, but this was really unexpected :D