http://www.eetimes.com/document.asp?doc_id=1319706&itc=eetimes_sitedefault&cid=NL_EET_EE_Life_20131004&elq=ad91ea8c6c224afa9ee7ad746fb97f5c&elqCampaignId=1523
Aside from the fact that it sounds like a weedwacker, it's an amazingly fast robot with no tether. At one point, it does slip but recovers nicely.
