My Magic Bullet broke after many years of daily use. Actually, it was a black plastic piece on the motor shaft that the blade assembly nestles onto that broke. I didn't think that super-glueing it back together would work due to the pressure exerted on that piece. So off I went to buy a new motor.Prices of motors alone (on eBay) were about the same as buying this entire Cookinex set, so I went for this set. If you look closely, it appears to have an identical motor to the Magic Bullet, so I took my chances.I am now happy to say that it IS completely compatible.1 - the blade assembly from Magic Bullet fits onto the Cookinex motor and turns on properly.2 - the cups from the Magic Bullet set screw onto the blade assembly for the Cookinex. I tested the connection and there was no leakage.All parts are interchangeable, so now I have some pretty new cups as well as a fully functional motor replacement for my Magic Bullet.Hurray!We use it mostly to mix shakes and chopping up nuts and spices. It chops with ease and only binds up on really hard things. All in all this unit works pretty well. The only thing I wish is that it had handles on the cups, but I guess it's no big deal.It doesn't work as good as the magic bullet. my blades keep getting stuck when i barely have anything in there.2yrs later and this is still the most used appliance in my kitchen. Often this is used by 3 different adults per day, so it has definitely been worth every $.This is my second one of these. My other won finally wore out after using is steadily for over 3 years.This was a cheaper blender than nutribullet, but I am so impressed with how smooth the smoothies are that I make with it!