I had a Guru fit, and really wish I'd done the Retul. That said, however, as I wrote in another post, I hated it for 100 miles, the pain in my knee got worse, and everything just felt blah. Eventually I moved back to my old position, which had the saddle in the center of the rails, and 1.5cm higher. Then I got a new saddle, and that changed everything! I moved the saddle back horizontally to where the fitting had it, but Still kept it raised 1.5 cm. I have a much better position now, and, on balance, it was worth the price of the fitting, but the Retul uses more than just "how does that feel?" to configure your position, and I think that might be superior. I'll probably get one next year.