The 2011 Ford Fiesta being released this summer has an available 6 speed automatic. It is sealed. It has a 150,000 mile life expectancy. That may be fine if they are designed to be easily replaced. I would hate to scrap a car because the sealed transmission wasn't repairable or available.
I know very little about the Mahindra 6 speed auto but I would like it to last longer than 150,000 miles. The diesel engine could last twice that long.