I’ve bought two of these, so I must like them. For the money, the Prime is tough to beat and it actually flies well. The instructions are fun to read because of the trippy translation, but they only give you an idea of how things go together. I just have a few comments and couple suggestions when you are gluing it up.
The foam is a little heavy but very durable. I smacked my first one into the ground numerous times and only suffered just a couple tears that were easily repaired. The supplied hardware is decent, but I did replace the control horns with Dubro items. The stock horns are a little short and don’t have adequate offset to get the pivot over the hinge line on the wings. The carbon rod is usable as are the provided wire Z-bends. Enough rod is provided to allow you to brace the tail feathers if you are so inclined. The kit comes with laser cut wooden servo mount plates and aileron control horn mounts. You can use these if desired or just cut some pockets and glue the servos in place.
Pay attention when gluing the fuse stiffeners in place. It’s easy to pull a bow into the fuselage. Also, line the stiffeners up with the front rather than the stab slot as you want the stiffeners to support the motor mount. The instructions say glue the motor mount together before gluing it in the fuse. I suggest you fit it up dry, check it in the fuse, and make sure you don’t put weird thrust in the motor. Then slather the whole thing with glue and mount it in the fuse.
When mounting the wing, trim the foam flashing between the ailerons. This makes it much easier to get the wing in place. CA hinges are provided for the rudder. These work OK, but you could probably use tape if you prefer. Finally, the elevator and rudder servo locations are not very well defined. I mounted them both within 6 inches of the tail and was able to get the plane to balance by moving the battery.
That’s about it. Good 3D trainer and if you strain it through a chain link fence one too many times, a replacement is only $35 away.