i have an EB4-S2, and a GS Storm pro (well, had the pro), anyways, i noticed a draqstic improvment with the EB-4 over the storm. much better handling buggy. something to be warned about with the mugen is that it doesn't seem to be near as sturdy as the eb4 or the kanaii, its ment more for flatter track racing. the kanaii is a great buggy, but is VERY overpriced. if u look at the european sanctioned races, u will see that over half the field uses the EB-4, just hasnt really caught on much here in the states. if u can get the parts, i would recommend the EB-4, just as good as the kanai, but half the price. if parts are hard to come by for the eb4 in your area, go with the kanai, its a proven winner.