This set of markers was a gift for my teen that is very into art and will be taking art as her concentration in in high school.  Her art changed dramatically after receiving these and a set of Prismacolor Premier pencils.  Having high quality tools that are right for the job caused a dramatic change!  She uses these markers daily and they have held up to heavy use for 6 months without any change in performance.  The colors are strong without leaving any streaking or overlapping lines.  Every marker is still going as well as they day she opened them on both tips.  These are on the expensive side, but they have been well worth every penny.