Love the Volador Frames, highly recommend

Volador VX3 VX3.5 O3 Freestyle Frame Kit

Very happy with the solid construction of this frame and the labeling of the screws and parts made it very simple

I like the frame. But Quality test is bad.
My frame was missing 4 flush nuts. You have to find different screws plus nuts, which I did not have at home.

Very solid littel frame, almost no vibration to filter tuning. Also comes with variaty of accessories, upgraded battery strap, sticky battery pad and even the stl files on thingiverse for you to 3d print yourself. I've built a 4s quad with it, considering to order another one for a 6s build.