The Asics Gel Blade 2 model seems to be a preferred Asics squash shoe on the pro circuit.
This shoe is used by top-10 players Karim Darwish of Egypt and Laurens Jan Anjema of the Netherlands.
Karim seems to favor the white, black and red version that you see above.
LJ Anjema wears the white, black and gold variety:
Here’s a great video of LJ Anjema training. This is an awesome video all around, but you get a good look at his shoes at the 0:37 mark: