pretty much spins motor without blade movement at anything above ...
598111
Does not handle smoothies nearly as well as reviews stated, pretty much spins motor without blade movement at anything above medium speeds. Smoothie mode (on/off/pulse) works only a bit better.
4504031
The copter constantly rotates on it's axis despite constant trim adjustments with the trim switch and left joystick. This is very annoying when trying to maneuver with any accuracy.

I played with this for several hours but cannot resolve the problem. I believe the issue is with the remote controller.

After about 12 flights, the left front motor burned out.

Update: Red Rock USA gladly sent me a replacement motor. However, after installing it this weekend, (with difficulty), I found that the related control circuit for that motor also shorted so that the motor runs full speed as soon as I connect the LiPo battery.

Now I need a replacement receiver board to get it flying!

I'm afraid I can't recommend this quad at all as it appears to require a lot of replacement parts and labor to keep flying.
2393525
These replacement mades don't seem to be built to exact specifications, because they cause the Magic Bullet's motor to engage (and smoke!) without spinning the blades. If I had to guess, the blade mechanisms are made a fraction of an inch too short, which is preventing them from making contact with the motor engagement mechanism on the magic bullet.

FYI... I tried both blades and in various combinations with 5 different magic bullet cups, and I have used this magic bullet hundreds of times without incident (both with the original and other replacement blades). It is most definitely these blades, not the Magic Bullet.

I'm going through the reporting process with Amazon and I expect a full refund without being asked to pay for return shipping.  If not, I'l escalate and have to decline the puchase through my credit card.  I hope it doesn't come to that.
2191463
And have the patience of Job...maybe one day you will find some enjoyment
Nearly impossible to control both indoors and outside.
Controls are mostly counter-intuitive when they work at all, and non functional most of the time.(I have flown actual UAVs in the military with less of a learning curve).  Out of the blue this product, had 1 rotor feeze and not move.

Video is good
3675640
I sent an email to Promixx concerning my dissatisfaction with my purchase but I have not yet heard a response. I owned it for a week and loved it. Then it stopped spinning the blade. When I disconnect the motor from the cup and press the button it seems like it has plenty of power. It charges well. As soon as I hook it up to the cup, it will hardly spin the blade. I want another cup to replace this one. From reading recent purchases, it seems to me that Promixx may have started to use different parts or manufacturers because it suddenly has gone from 5 star reviews to 1 star reviews consistently. Please respond.
2549920
Good motors, powered my f450 clone well, good thrust with 9045 propellers (1045 propellers didn't work too well tho...)
But then I noticed it always drifting left, and that one of the motors didn't spin freely like the others. Took a look inside of that motor and found 2 of the magnets had broke in half.
I hadn't had any crashes, so it had to be due to the manufacturing. In manufacturing I feel like 1 in 1000 is usually defective, no matter what it is your making, and I just hope that the one I got was that one...
 I can't complain tho because when you pay for four motors what one usually costs, there could be some craftsmanship issues.
So 3 of the 4 motors run flawlessly, but i need 4... So I returned it and ordered another set (exchange basically) because they are an amazing deal hoping I will not encounter the issue again.
1124287
<div id="video-block-R1BBJZXMRH9S7C" class="a-section a-spacing-small a-spacing-top-mini video-block"></div><input type="hidden" name="" value="https://images-na.ssl-images-amazon.com/images/I/A1cirPM6MTS.mp4" class="video-url"><input type="hidden" name="" value="https://images-na.ssl-images-amazon.com/images/I/71rS8Y7rmVS.png" class="video-slate-img-url">&nbsp;Faulty fan motor.  Makes an aweful grinding noise and doesn't pull air.
2159354
This is a wonderful demonstration of a magnetic motor, the simplest of its kind in view of its use of the least number of magnets, each deployed to great effect.  It turns, occasionally needing help to get it going, under an LED light over my kitchen table.  Where I have it presently--on a shelf in a bay window facing southeast--it turns on its own, and it turns fast, its propeller a mere light blur, as if the whole thing would fly off.
4503204
These are nice little drones. I purchased one and it is extremely fun!. I then pulled the blades off to clean some hair out of the rotors, put them back and and it won't fly. So I sent it back. The next one, same thing, flies great, clean the rotors, won't fly. I didn't realize that there are 2 types of propeller. One is designed to provide lift spinning clockwise, and the other, counterclockwise. IF YOU TAKE THE PROPELLERS OFF FOR CLEANING, PUT THEM BACK ON IN THE RIGHT PLACE! Or your drone will not fly.
4716100
Everytime i have used this it will not cut anything, there is something wrong with the bearings.  It is shaky and there is a factory defect.  I changed the blades, but i believe it is the bearings.
4927553
it's an on/off pedal IMO.  no sweep.  I read somewhere I have to go in and make adjustments. WTF?  It's quiet and does that.
2345429
My Dewalt trimmer motor just died at 39 months (had a 36 mo extended warranty)
It was lightly used to trim our yard for the 39 months - not a tool used heavily by a landscaping type company.
Googling shows many complaints of grenaded engine magnets.  Batteries are fine -have two of them, charge fine, motor clicks but no rotation, cleaned it well no luck.  I bought it for Dewalts reputation but I am very disappointed - headed back to Ryobi products now.  It is a great design but I am now very disappointed.
4684844
It's better then getting a ordinary slider without the bearing. You won't be disappointed. I like how you could re-adjust the bearings position to tighten it so there's not much play. Also if you wash the bearings and put much thinner and light lubricant it will make the bearings spin more freely
1928667
May have received a defective one, but the motor will turn less than 1 revolution before getting stuck and just making a horrible clanking noise over and over.  I am using it with a 12v battery pack, and a PWM with reversible direction and speed control.  Extremely disappointed.
746586
Operates fine , but doesn't come with a motor. I could have bought a complete unit for same cost
628607
This is a good motor, but be advised that it will start and run in either direction. Also, is over-torqued, it will stall and reverse direction.  For light duty use, however, it is a bargain.
4656123
Reviews were very good for this item, so I bought one. First flight was about 30 ft high then landed gently in a grass field. It was an excellent flight, but when I tried to take off a few seconds later the right front blade would not turn. I examined it and there seemed to be a short in a wire or inside the motor. I returned it and Amazon was very good about giving me credit. I purchased a different brand which I have yet to get.