I know a lot of people hate on these "cheapo" picks with all the fancy-pants new materials you can buy picks from but let me tell ya - these are great! Such a fast release from the string and a clean tone! I recommend them fully as long as you dont have super sweaty fingers (obviously the grip isnt the same as a brain pick)
I have used these picks for a few years now. They feel slightly heavier than a medium pick, which suits my style of playing, and the grip is excellent. The Delrin material is very durable and as a result, last quite a while.