I have used the Jazz III XL for about 5 years and it is by far, my favorite plectrum. I use it for djent and metalcore, so it is quite comfortable, especially for patterns and sweeps. It is thick and durable(I actually still have a couple of 'em left from my first pack, so they do last long). There is no downside for me. They are just what I need. I prefer them over the regular Jazz III, because with these, I can really feel the playing.