I have experience in different mixer grinders. From my home and from my relatives, friends reviews I heard abt the use of Sumeet, Butterfly, Crompten Greves, And National. Among them The most worst is Butterfly. Sumeet is excellent but easiness is not so comfort compare to National and Crompton greves.
My recommendation is for National. Now known as Panasonic. I had purchased one 7 yrs before. Excellent in its use. sharp blades. Three separate jars. One is for chutny. another one is helpful for grinding, juicing etc. Then the most big jar is very helpful for making batter for Idly and Dosa.
Its a 550watt machine. Pricing abt Rs:3800/-
In these 7 yrs of use I never felt any complaint, except just few days back the jars under bush button damaged. That you can replace from any of your nearest service centre. Still the motor is in good working condition.
I am fully satisfied with this mixer grinder, as I am using this daily.