I can not tell you to not buy it because I just bought one.
In my case I already had the M&P - 15 sport. Love that gun too.
All ways wanted a M-1A but here in Maryland it can no longer be bought, sooooo M&P - 10 was my next choice . I like the feel of it , but have not shot it yet. I also reload so the price of ammo is a little less concerning for me. Good luck in your choice.