I have tried different thicknesses and spring strength, but my review is the same, they are amazing, you just need to find the one that fits best to your feeling and playing style, but I can almost interchange any of them and play quite similar. So as said, my opinion is the same:
It can't get better than this. I always struggle with picks and sweaty hands and I also am mainly a finger picker, so using hybrid technique has been for me an struggle, until I go this. Since it has the spring the tightness is not painful as in the fixed six, but the grip is strong enough to play properly with fingerstyle or pick techniques.
Material is high quality, it seems that it will last for really long time, the thickness is good for both strumming and single notes.
So, I can't fault anything about this product, I think someone finally nailed it, as I never managed to use thumbpicks, they are normally too long or too tight and the shape never allowed me to use it as a regular pick, while this one feels and plays as a regular pick if you hold it with thumb and index finger, but it DOESN'T slide from mi fingers and then I can also use it as thumb pick that is not to long as usual neither it gets caught in the strings as always happen to me with those.
In the end, highly recommended, I hope this brand is a success so they remain in the market forever.