I've built two of these myself. I built one for top speed runs ~134 mph on 4s (that's slow for this frame) and one for racing. My chapter is pretty inactive right now due to temperatures and weather but this is the most responsive, locked handling quad you will ever fly. It is more fragile than something like a floss with 5mm thick arms. But the frame is surprisingly strong for what it is. If you build one you won't regret it.

Hey, thanks for chiming in. What is your racing setup with this frame? I'm currently more into freestyle, but thinking of getting into racing in the next season.

I'm wondering how well this frame holds up? I'm looking to get into racing the next season as well and am looking at a frame that is more durable than fast because I'd rather finish a race than crash out.

For racing I'm keeping it as light as I can to avoid destroying frames constantly. I'm flying a 2mm 5" version of the frame. The components I'm using are Hyperlite 2205 2522kv, a Bardwell V2 fc, and the racerstar/rcharlance 35a 6s esc (awesome cheap esc btw). I fly it with 1300's bottom mounted with the stack built on top of the frame like you see here. The frame itself is surprisingly configurable (can use any battery orientation you want) so I don't use the carbon fiber battery cage pieces. The 2mm version of the frame is quite strong for what it is, but don't expect it to hold up like a Rooster. I take two identical quads to race because I almost always end up breaking an arm. Arms are cheap though, and In my opinion well worth the huge advantage this frame gives you.

Thanks for sharing! Is there any particular prop you can recommend for that setup? And another question, did you get a chance to fly it against 6S quads? I hear the message that you don't actually need 6S if you get the motors, props and weight right, but it kind of feels like 6S is becoming the new 4S, so I'm wondering.

I will have to try a frame like it for racing. it looks like propwash is a non issue with the way the arms are made.