While I test drove the S85 originally, I have driven P85s on several occasions – and honestly, I never even notice the difference if I'm not looking for it. Even the S85 I purchased offers far more acceleration than is appropriate for the vast majority of situations. When trying to get other people excited about Tesla it's easy enough to impress them with the performance of mine, and then I can point out that Tesla actually offers several steps up in performance from there. I haven't regretted saving the extra $$$ in the least.