I absolutely love these picks. I play bass, and these are perfect. I love the large size as i have large hands.
The Surge has a bit more flex and can work equally well with acoustic or electric, great for more aggressive sounds
The first time I used the Surge II was with my Takemine jumbo acoustic, it projects well as it is but the pick took it to another level. With electric it to an overdriven sound and added a good amount of aggressive attack