Great colour scheme, the contrasting colours on the light grey backdrop work well. I like the way the forms cut and intersect each other too. The addition of the "bubbles" is a pretty cool detail too... very intricate. Nice weighting to the image too.. that slightly angled line at the top sets it all off nicely.
I'm impressed by the pure simplicity of it. No bells, no whistles... Everything looks remarkably clean, yet it is still so intricate somehow... based on compositionm, I guess. Wonderful. It stands out from the "vector crowd".