I personally had a bad experience with Rodeo. And 1 of my friend has Pantero.
Let me list out the pros first:
Decent mileage
Price
And here comes the list of cons:
Service is too bad. Even the dealer themselves are not sure of parts availability 100 cc engine is too low for ride with pillion passenger. On highways, you feel carried away with the wind as the fibre parts are not that heavy. (on personal experience on a ride on NH 45)
I am not sure how reliable the parts would be. By the way they appear, I am pretty sure they are of low cost. When you see a Yamaha/Honda/Suzuki, you can understand this.
Mahindra is good in heavy vehicles but, severely lagging in 2 wheeler. If you want to buy an Indian brand, I prefer Bajaj & TVS than Mahindra.