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.
About VIP-Ice: VIP-Ice is a premium blend of plastics that provides a stiffness between VIP and VIP-X. It has great durability, and more overstable flights compared to regular VIP.
About Glimmer: Color shift combined with a glimmer effect.