HS81 is actually faster, when speed hacked, than the Naro. I went the other way (HS81 to Naro) on Pants and was quite shocked how slow the Naro was in comparison.

At least if you start with a speedy one, you HAVE to learn to drive it....I suggest driving it around a kitchen worktop - youll soon learn to control it in favour of it falling off....

http://www.robotwars101.org/antshttp://www.robotwars101.org/ants