I have a 3516 I bought in 2014. For the size, Mahindra's are the heaviest tractors in their. I like mine but it is not without issues. All the electrical system is very cheaply made. Connectors are thin. The battery terminals are made out of copper foil and corroded away in about 8 months. I also think their HP ratings are very over-rated. Mine is supposed to be 35 hp but seems rather weak compared to several other 35hp tractors I have operated. Same goes for the power take off. Seems to stall more than I think it should. I have the FEL on mine and that is the one thing I actually love having. I bought mine with a finish mower, a brush hog, a 5 foot tiller and a post hole digger. I think I paid just at $15,000 for the package. The only thing I hated was the clutch. In damp weather if you let it set for a couple hours without locking it out, it will stick. I had to have mine taken apart last year because it sat for several days. Would I buy another one in the future? Probably. For the money, there is nothing on the market in it's class. I would go for at least a 60hp though.
P.S. I almost forgot, the seats are pure junk. I know of several people that had the same issue I had. They are held into the frame with cheap construction glue and WILL fall apart if the tractor is kept outside.