I was able to try the adaptive and standard seats in a 2005 Boxster, as they are apparently identical to those in the 911. I'm 5'11 145lbs and while I loved the adaptive seats, the standard were perfectly good for me as well. I chose to keep the standard. The electric seat function is key, though, to make minor adjustments (which I am still doing after 2 weeks) - even if you are the only driver.