Not a problem yet!!!
I love this car. I previously had a miata and that was race-ready. The Boxster handles better than the Miata did with a Tokiko Illumina 5 way adj racing suspension, stiffened springs, new anti-sway bars, and beefy 17" wheels and tires. The only complaint is that the seats could stand to be 2" wider.
I found the seats to be quite comfy - the car wraps around you like a clamshell. However, the standard seats could have better support - a lot of people have been retrofitting lumbar support. Also, if your upper body is long it is quite possible to hit the roll-bar during collisions because the seats are so flexible.
For all the people that said the seats are too small, the your probably too fat!!! I find the seats to be quite comfortable. I just have the standard seats in my car, but I must admit, the upgraded sports racing seats are a little more comfy.
But overall, no problems with the car. Porsche Boxter is a great automobile!
Sept.3,2004.. The seats in my 1999 Boxster are indeed too narrow. I am small, 5'5", and 150 lbs. The seat side bolsters cause soreness in my kidney areas, and no lumbar support makes the seat uncomfortable. I am going to try to get the seat modified...otherwise, I love this car!