I am a fan of six wheeled bots and have been reading the lengthy post here on that topic.

I am a fan becuase our team can afford to add a third wheel to each side without the need for a lot of extra engineering.

Many of my students however are still fans of tank treads. We have never gone that way, we've only had four or two wheeled bot, because of the expense of pulleys, buying extra timing belts for treads...
My question is, How many teams still design and use tank treads on a competition robot

What advantages do you think you have over the latests trend of six wheel robots

I still don't see us going with treads and this is a general curiosity of mine.
APS