i have the hex head R12R and the Tlever really ruins that bike's handling. The front pops up under power and there's, little dive on the brakes. Most road tests say Tlever fronts lack feel. I'd add they make for a choppy ride. I had GSs for years and the longer travel makes the ride better. I've changed the dampers to Ohlins and tuned springing and damping to perfection, but I still don't like the ride. Even the so-so Sachs on the 90 will be a huge improvement.