Having trouble fitting enough lead on your chassis to make weight? Want to quickly/easily change your F/R bias without the hassle of pesky stick on weight? Into hiding your chassis under a towel while it in the pits, "Green Gas Tank Syndrome", or outright subterfuge?
Okay, seriously, considering I put something like 150 grams into my XXX-S to get it to 1552 and I only use about 1200mha in 10 minutes, this is kinda cool.
http://www.teamorion.com/weight-transfer-system-en.html