The Siren gets a place on this list because of its versatility and well-thought-out design. It’s not perfect, but it’s got enough going for it that some people are going to love it. It can mount almost any video transmitter and camera you prefer, even large digital ones; and there are clever 3D prints to keep things clean and tidy (we love the dual capacitor mounts).
There are four versions of the Siren F5. The “standard” one has a single-piece bottom plate with 25mm height through the entire length of the frame. This version can fit up to 5.5” props, and those using 5” props will appreciate a little extra room between the body and the props (fewer chopped battery leads). The “split” version splits the bottom deck similar to frames like the QAV-S and the Apex. This means the middle and rear of the frame have shorter standoffs, for a more compact build. Both the “split” and the “standard” versions are also available in a “mini” version which has shorter arms and is lighter weight. The “mini” only fits up to 5.2” props, but otherwise shares the features of the larger version.
The “standard” Siren frames weigh around 105g, and the “mini” around 95g, which is extremely light for a freestyle frame. Lighter builds can be more nimble and fly longer. They have been carefully designed for stiffness and resonance, so they should fly well on default PIDs, and those who push PID tuning the limit will be able to get a lot more out of these frames. However, lightweight freestyle frames are not the most durable. If you fly hard and crash a lot (especially into concrete or asphalt), this may not be the frame for you.
Most complaints about the Siren frames center on durability. The standoff screws are M2 size, with a vibration-isolating “sock” over them to bring them up to the standard M3 diameter. M2 screws are much more likely to bend in a crash, and most FC and ESC already have vibration-isolating “gummies”, so many people would prefer this frame come with M3 stack screws. Unfortunately, this isn’t possible without modifying the frame.
The frames also don’t have mounting for 20mm FC/ESC. A larger 30mm ESC hangs out over the hourglass shape of the frame, and some users complained that this caused the ESC to take more hits and die sooner.
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