Hey i wear about a 9. Do you think I would...
Hey i wear about a 9. Do you think I would have trouble with this board because its a mid wide?
you will be fine with size 9's
yeah, you'll be fine... In my personal opinion, the benefits of a lil' wider waist width is stability!
The only time time a wider waist width is no fun is if you have a really small foot -- say size 7 -- It would be challenging to get a mid-wide, or a wide, to go from edge to edge. The 157 Joystick is about a 252 ww... to compare a normal waist width burton custom would be about 249... so, not a huge difference but enough that someone that doesn't want to quite go to a wide can handle it.
You should have no problem as well, with a 9, getting it from edge to edge. (you just won't have to worry about toe-heel drag at all where as a 13 would)