Well, I've got the E550 which is almost the same weight as the 620 (minus the battery packs). They are within one to two ounces of each other. I've seen several folks on RCGroups who have both E620s and TRexes post weights of their setups and they weigh the same or are within an ounce of each other so the idea that the TRex is so much lighter doesn't hold water. If I can run my E550 on 6 cells and 550 blades (or mount up the C/F TT600mm blades and boom I have) then I have a known baseline to compare. I believe that the TRex should fly similarly on 6 cells (keeping in mind that the TRex has 19 gram paddles and quicker head geometry vs my 20 gram paddles and lightweight build). Yeah, the TRex will be a little more spritely in the air, but at what cost to cell life running 600 mm blades off 22.2V ?

My question about the Nitro TRex is to see if it flies like it has any more power or is about even with the 6 Cell TRex. I've flown nitro years ago and do not like the mess or the gear I have to carry to the field so I don't want to go back to that again.

I've seen that video before and it's a favorite of mine. However, I've seen Jason Chow throw an E550 around on 6 cells and I can see the difference between the two the TRex does fly better. Might be because of the stick actuator and larger blades?