First of all please understand that what I am posting here is my opinion through about 50 hours of using this frame. I am a quadcoptor novise, so please feel free to correct me if you think I am mistaken.I am using the 3DR frame and hope that this feedback will provide valuable input for a v2 design.1) Motor mounts:The motors mount directly to the aluminum frame, causing undesired vibration. Perhaps a simple foam mounting pad could help correct this, but the bolts would still be an issue.The most serious issue here is that a hard landing on any arm may cause the frame to bend because of the motor mount (this happened to me after a hard landing on 1 axis on grass). I want to make sure I am clear on what I am talking about here - this happens when the motor is forced towards the center of the frame because of how close the outside motor mount hole is to the edge of the frame. A possible solution here would be to provide additional internal structural support by running the motor bolts through 18mm plastic standoffs on the inside of the frame.2) Landing Gear/Leg mounts:One of the major issues that I have run into while leveling this frame was became the legs -- they will shift both forward and backwards because of the mount to the main frame. A hard landing or two (like shown in the 3DR frame stress test video) will cause the metal screws that mount the legs to the frame to force the M3 holes in the fiberglass legs to be oblong and allowing the legs to move back and forth.This may not seem like much, but when placing my 3DR frame on a 100% level slate pool table it wobbles on each axis. I solved this by placing the quad on the pool table and placing a bubble level on each axis while adjusting the legs back and forth. WHAT A PAIN!!!3) Landing Gear/Legs:The black M3 female to female 18mm hex standoffs are proprietary; the only source I have found for them is DIYDrones store. A good work around here is to use three M3 nuts and an M3 25mm bolt to create the same effect and will actually provide much better support than the OEM solution anyhow.4) Base level mount (power distribution):When stripping the 3DR frame down to the power dist level the entire frame will want to fall apart because all bolts are mounted from the bottom. A good work around here is to use plastic clamps on each arm or a dab of hot glue/etc on each of the eight bolts that mount from the bottom.That's all for now - I hope this information is helpful.