Isn't this a dream servo?? Cheap, powerful, fast, metal geared, 360deg

I'm struggling to see the catch? I've just bought a hextronik MG14 for £9:-

Voltage 4.8V ~ 7.2V Gears Metal Speed 60° in 0.11sec Model MG14 Weight 14gr Torque 2.5kg

Whereas the "dream servo" seems much higher specced for only a pound more at £10!

Voltage 4.8V ~ 7.2V Gears Metal Speed 60° in 0.16sec Model FS5113R Weight 58 gr Torque 13.2kg/cm

Thanks ...

It's the size. 4x the weight, 4x the torque.