This is a nice build! All the angles on the sides make it really look tough, as if it could simply shoulder its way through the other racers. The greebles are nice on the bottom, but it would look better if they went down the whole speeder.
Well, it's not bad. I like all of your SNOT on here, that looks great. I also like all of the angles you got here. My problem is how it looks from the side. It looks just cubed, despite all of the good angles. Sorry. Oh, and I like the idea of greebs on the bottom. However, they would look a bit better in grey, and all through the bottom, not just the middle. Sorry for being nit-picky, just my opinions.
Woa! Nice MOC! I love the whatever-they-are's on the front and back corners. Those 1x1's make it look really awesome. Its amazing how you got such a blocky design (which I really like) to look so fast. Great job!