If you are planning to buy a mixie from India, it might sound to be cheaper. But here is what you should know before you buy -
1. Using a convertor is not safe at all times.
2. This also reduces the life of the motor
3. Motor heats up fast.
4. Covertors converts the current and not the cycles . so the motor run at a un intended speed that might require frequent service and change the spare parts.
My suggestion is , you can use a convertor to any equipment if it is a short time use. But if it happens to be a long term use, you better buy the mixie in 110 volts.
5. More over, the warranty is not good in the USA, if you buy a unit in India. Check this link below for Preethi mixie USA Warranty .
http://www.perfectpeninsula.com/warranty.html

Few months back I read an article, that the US Customs removed all the mixie jars as it had sharp blades .

I would suggest you to consider my thought, before you buy a mixie from India !