These picks are great. I have used them for a long time and will continue using them. Personally I am really happy with them becuase they do exactly what it says on the Box. I use the 0,50 Pick only for my accoustic guitar and I think that they work well.
Depending on your play-style, they will last longer or shorter periods. In my case, I can use one pick for about 1 month before having to throw it away because there is nothing left to strum with anymore.
The wear of the pick is very even but I guess that also depends on your play-style. I would therefore recommend these picks.Especially to accoustic players as I believe they feel nice and comfortable and last you for some time.