The 2010 Kia Forte isn't exactly a driver's car in LX or EX guise. There's lots of body roll during enthusiastic cornering, and the steering is rather numb. However, the SX model's sport-tuned suspension makes for a night-and-day difference. It's still not as sharp as something like a Honda Civic Si, but the SX's overall driving dynamics put it at the head of the economy class.
In any trim, the ride is comfortable enough, and with the exception of intrusive road noise on some surfaces, the Forte is a confident highway cruiser. The four-speed automatic's tall gearing means you've barely crested 3,000 rpm in 2nd gear at 45 mph -- good for your gas budget, but decidedly unhelpful if you need to pass anyone while traveling at that speed. On the plus side, the the five-speed automatic is a capable unit, particularly when mated to the SX's 2.4-liter engine. The SX's manual shifter, however, is as vague and rubbery as they come.