First of all, I'm more of a finger-style guitarist, so I seldom use picks. But now and then I feel the urge for that louder and brighter sound, so I reach for a pick not too far away from me.
If that pick would happen to be a Tortex Jazz III 1,5 I'd be slightly dismayed, but I would keep on playing. They are really durable and have a nice bright sound, but I would say that the grip isn't very good.
Then there is the personal factor, and I simply cannot get along with these as well as with others. I cannot help but feel that they are a bit clumsy and soulless. I much prefer the Ultex versions of the Jazz III, which are much brighter and have a nice grip.
Would I recommend them too someone? No, but I wouldn't dissuade someone from using them either.