I had a suspension seatpost on my commuter. I called it the Power Hog. It sucked too much of my pedaling energy in bouncing up and down - especially on the hills. I replaced it with a carbon post - my LBS made me an offer I couldn't refuse, I had no intention of putting such a fancy post on this bike. I love it. It doesn't beat me up and, in fact, I find the ride smoother and more comfortable now.