Avoid it if you can. It will sound nothing like what your keyboard is supposed to sound like, and if your playing live, what the audience hears in FOH will be very different than what you hear on stage.
Keyboards are full-range instruments. They are best amplified through a small PA (such as powered speakers) or dedicated keyboard amps.
All the jamming studios in town that I have been to that have keys use the Peavey KB series amps.
A good test is the "Ipod Test". Plug your Ipod into a guitar amp. Sounds awful, right? All midrange. Now plug your Ipod into a PA or keyboard amp. Yeah baby yeah...