The Westside Harp is one of the most well known approach discs on the market. If you are a forehand approach player, you are missing out if you do not have one in your bag. The BT plastics allow the harp to slowly beat in so that eventually you can have a straight approach disc that still holds up to the wind out on the course.
This is my go-to approach disc. Mine is in the BT medium plastic. It's overstable for my arm speed and I can throw it straight into the wind without issues
