I mainly use this pick when strumming chords on my electric or acoustic guitar.
It's really nothing special, a standard 351 pick out of delrin. One of these lasts me about two weeks of average to intense playing. However if you're using a nylon stringed guitar it's likely to last longer.
I really like the sandpaper-like texture where you're holding the pick, and that's probably the greatest thing about these picks.
I can't find a single flaw that doesn't exist in all delrin picks so there are no real cons to this pick.
Overall I think this is a great buy for anyone looking for a bunch of cheap picks that will serve them well for the entire lifespan of the picks.