I've had one for a few days now. Still breaking in the engine so no hard acceleration yet, but seems quite peppy for a 4 banger. The engine noise does sound like you're flogging a small engine as opposed to a nicer smoother sound from a V6. Once I do some road trips and see how it does on long highway runs I'll have a better feel for the torque on hills and passing.
I had the 2013 4cyl GDI and had no issues at all with the power. Even here in Atlanta with the hills and mountains, it did the job. The gas mileage was a bit disappointing however. Trips to SC and FL are included in this accessment. I only upgraded to the V6 AWD EX to tow a small boat....and different color..but don't tell my wife.