RE: Upgrade CP or get a T-Rex?
I'm with the rest of them.
You can spend a ton of money upgrading a CP. (I did)
You wind up with a CP that has the price of TREX and is still...... well, a CP.
I just built my first TREX yesterday. I'll pick up the my gyro and tail servo, to finish the setup, this evening (I would have been better prepared if I had any clue the build would be so easy).