The IRIS is a prebuilt quadcopter made by the popular drone company 3D Robotics. The basic package without any accessories costs about 750 USD and comes with a wireless data antenna and a custom transmitter.
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Pro Excellent camera mounting options
The IRIS comes with an integrated mount for a GoPro, meaning you do not need a gimbal for filming. It includes a vibration dampener for smooth video. For better filming you can purchase the Tarot brushless gimbal with better vibration resistance and a "lock-on" feature which keeps the camera pointed at the target of interest no matter where you fly.
Pro Higher payload capacity
The IRIS is slightly more powerful than other drones which means it can carry a weight of 400 grams or a GoPro. This allows you to add more components or even a larger battery for additional flight time or to power additional devices.
Pro Easy to setup and use
The IRIS comes prebuilt and is easy to use right out of the box. By using the included 3DR Telemetry radio and Android OTG cable, all you have to do is plug the cable in and use the free mission planner to easily plan out your flight and use the emergency return home and flight monitoring features. You can also use your phone or laptom to control the IRIS's flight plan.
Pro Uses the Pixhawk flight controller
The Pixhawk is an advanced contoller from 3D Robotics with a processing power that is 20 times faster than their previous controller. It comes with features like *nix-like programming environment, new autopilot functions, airspeed sensor, among others.
Con Very high price
With the base model costing about 750 USD, the IRIS is a very expensive option compared to something like the Parrot AR Drone. That's not including the $220 camera gimbal, $300 GoPro 3, and varying replacement parts you need. The costs on this drone add up quick which could seriously affect the IRIS as a buying option for most people.
Con Adding something other than a camera will be more difficult
Despite the easy camera mounting options, due to the shape of the IRIS adding your own payload, such as a small computer or antenna will probably involve rubber bands and duct tape.