Extremely fast servos with good amount of programmable features. Sensitivity, dampening, centre angle, soft start and a few more. Very very responsive and probably overkill but it's in my OmpHobby Edge 540 60" couple with 120a platinum V4 esc and AXI 4120 465KV. Making a power combo of a 3D acro plane. Definitely worth £59.99 at the time of purchase and would easy be a contender for the likes of KST and MKS. Longevity of the servos and potentiometer are the only things that need a reviewing as I've only just installed. Watch this space.