Metabo US Concrete Renovation Grinder .
Also, the Metabo supposedly has less vibration and is easier/more comfortable to use. After grinding 700 sq/ft of filthy 25 year old concrete ( a total of 7 hours) I have the following observations. The grinder pulls a lot of power, it ran best on a 120 volt 20 amp circuit, and nothing else could be plugged into the same circuit without popping it.