After driving the Optima for five days straight for 10+ hours per day, other than the occasional stop, on a road trip, not one time did I get a sore back or thighs.
The people at the Kia dealership were extremely friendly. Even in August 2007 when the Optima was purchased, everything went very smooth, and I could not believe the level of THOROUGHNESS! Kia dealerships are doing it right.
So far my experience with the Optima has been outstanding. The perfect roadtrip car. The perfect around town car. Exterior styling is just a little bit conservative, but it is worth having such a powerful, comfortable, inexpensive and reliable automobile.