There is an issue with some of the material in the 5 speed autos in the 05-10 cars coming apart and causing early failures but they may have fixed it in the late run transmissions.
However nothing wrong with an auto really. An automatic is actually going to be faster in a drag race, at least with some mods and a good tune. Now, the big thing I've seen as a problem with 2010s is that people think they are worth KBB and they aren't even close. Hopefully you got a really good deal on it because for a little more than KBB on a 2010 you can get a 2011 which is a night and day difference.
Post up some pics and more details. A girl at my work has a 2010 and it is really nice.
2000 Mustang GT Steeda build #48. Bolt ons, suspension, Novi 2000.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.