What's the point of measuring Ft for MOSFET?

MOSFET is voltage drive device, what's the point of measuring Ft? And what is the usage of Ft for MOSFET?

ft is the gain-bandwidth-product of your transistor. it's a measure of how much time the electrons (for n-channel) need to arrive the drain after being injected from the source. The transit time equals to 1/(2*pi*Ft). A larger Ft usually means a higher transconductance gm and a lower noise figure.