Pros : I use these brushes all the time. They are a staple in my stained glass studio. I use them for applying patina and throw them away when I finished. I cut the bristles shorter so they work better for me. I also use them for spreading on glue and sometimes for flux. I like to get the box of 144 - they are a good value and last longer.
Cons : For my use, I can't find any cons.