Has anybody used this got mat add on? Seems like a great idea. It's supposed to give you a more realistic feel and allow you to properly hit down on the ball. 

http://www.thegolfsale.com/the_first_practice_mat_players_say_that_...

Optishot is great but the hitting mat needs to be improved to give more give. Maybe a gel pad underneath the turf would be good. Something softer then then current pad would give a more realistic feel for the course.