I have built 3 Martian II frames and enjoy how much space they have. This one is very similar to others I've built; However, the top and bottom plates were about 1mm thinner than any other frame I have. I got a few flights but ended up breaking the top and bottom plates in a hard collision with the monkey bars. I split other frames in the same place and they are saved. That's when I noticed the difference between this frame and others. That being said, if you're a fairly conservative pilot and don't run into a lot of serious emergencies, you'll be fine.