I use these picks for 2 years ..
The fact that it "grip" it can not slip, they are just what you want to reach, I play 1.5 mm, before I played in 2 mm Tortex well I think the gator 1 , 5 also thick ..

it has become my mediator reference, I have jou in 3 mm (dunlop big home) too bad I wanted to return to something more reasonable ..

Finally, I like the look of the plectrum!