One of the guys at our club has one in his B4 and it is a WEAPON!

We race fairly casual, so it's not up against the top-end gear, but i'd say it will be fine until you are good enough to feel the difference in fine tuning options the top gear would provide. I am only a beginner to racing, so I haven't been caught up in all the marketing hype of the top manufacturers

Mind you, i'm happy with a Sidewinder ESC and 19 turn brushed