I had the opportunity to take the GT out for a ride. My observations are that I like the GTL mirrors over the GT mirrors. The visibility is an improvement with the GTL mirrors. I also noted less wind on my hands and forearms, which I attribute to the winglets. It's not a world of difference, but functionally, I think both modifications were a nice upgrade. Asthetically, I think it was an improvement as well. Had I not had parts laying around, I would not have been willing to incur the cost to do this, but the price was right.