The Exo is my current favorite. I really only tried the Gyeon on Mikes recommendation. Exo is great as a stand alone. If you shot me a pm with an email I send you pics after 12 months. My Photobucket is messed up
I almost bought some Gtechniq early on. The names were just a little too confusing to me. I couldn't keep up with what was what. I also don't want to top my coating with EXO to get the results I desire. I am sure they are great products, but I prefer others.