I came of age in the mid to late 1960s, when muscle cars reined supreme. Not only the pony cars, but mid sized sedans could be had with over 400ci V8 engines. They were called sleepers. I wasn't so much into Mustangs as my dad had a Chrysler Dodge dealership. For me it was Chargers, Coronets, Superbees with 426 hemis for racers and 440 magnums for the street crowd, and then in 1970 the Challenger came out. That was my pony car.
Getting back to the new Mustang, I like the the styling and the V8 is great. However, I can't stand to drive a modern car with numb sterring and the solid axle would get pretty annoying on the not so smooth streets and roads we have here. The New Chaalenger is not on my radar either. It's based on a full sized car and is too heavy, thus compromising it's handling. The independent rear suspension is a plus though.
The 60's performance cars were great, but the new cars coming out are so much better, the Mustang not withstanding.