This is the first, and only quadcopter I own. Literally ask me anything about it if I do not proceed to answer it now.
It has a nice size and is not extremely loud or annoying, but you can hear it (4 motors lol). If you break anything, it is repairable by connectors/screws, no glue or soldering. It flies great, although for more weight than just a gopro+case, you might want to look at the Syma x8 (slower, but more lifting power). Both quadcopters have 10-12 minute flight times unloaded, but with my quadcopter loaded with a 1300mah battery, gopro knock off + case, and fpv kit, I get 9 minutes of reduced throttle (smoother for recording video) flight time.
If you want to be able to use an automated, self contained 2D gimbal, neither of these drones could carry the extra weight for more than 6-7 minutes. Something like the CX-20 would be the best option for all of this.