Great performing Digi Servo at right price. Ordering for my Katana Mini 140cm. you can find specs for the servo, if you are scratch building, at:
I bought 3, one is not working 100 percent. I can still fly with it but it's slower in one direction and cannot be turned by hand, it also slows when reaching center but slight pressure makes it act normal.
I am using them for ailerons and elevator on my e-flight extra 300 32e @ 2.1 kg. They are doing well for my 3D flying although there seems to be quite a bit gear slop, not too bad though.
Overall it's good but quality control could be better, especially considering that this servo is quite expensive.