Depends, if you are happy with the speed and power of the stock truck then BL wont really interest you. If you would like a bit more speed and power/ wheelies, then a mild BL upgrade would make you more then happy (Im thinking a novak hvmaxx 6.5 here). If you want to explore just what the truck can do in terms of speed/handling/backflips, then the castlecreations MMM 2200kv system would blow your socks off.
Even just using good lipo batteries makes a big difference to the stock truck, but then you suddenly find out about the amazing quality (or lack there-of) of the the titans and evx2. Once you bru through a few sets of them you Im sure you'll come back asking about upgrading to BL, plus which lipos are best for any given setup etc.
Lots ot think about really, but just watch a few of the videos and you'll get an idea of the differences- search youtube for BL emaxx and weep
