
From a functional standpoint it is totally useness, but it is really fun to drive around as due to the close space between the tracks the turning speed is really great:

The best functional purpose from comments appears to be scaring away pets and small children
Oh yes, and it kept my own kids occupied for quite a while, which is a benefit on itself
Hope you like the model and I invite you to build it and experience it for yourself. Instructions can be found on Rebrickable:
http://www.rebrickable.com/mocs/martijn ... ed-cube-rc
If you like my work, also check out my other models on Rebrickable:
http://www.rebrickable.com/designer/martijnnab