I got my Koobi PRS Euro last Friday and rode a long hill climb with it. Sorry to say I was VERY sore, but I'm sure I had the nose tipped to high. I changed the angle and have ridden it only once more on a 45 minute flat ride. I probably have a few more adjustments to make until I find the right spot, but overall I'm very pleased with it. I definitely know that I am sitting on my sit bones now where before I wasn't. I do have some chaffing on one of my inner thighs (not that I have big thighs), but I'm sure it's just a matter of adjustment. I can definitely tell that the Elastomer Spring Tech. is working, really smooths out the rough spots in the road so they are less noticeable and makes for a nicer ride. I only have about 50 miles on it so far but can't wait till this weekend when I can try it out again. I will keep you updated.