Let me preface this with the fact that I am not a good guitar player.  I am a quite mediocre beginner that knows only the basics, but I have tried a number of picks, trying to squeeze out as much as I can from them to help me along with my personal skills.  These picks seem to work with that.  I went with the 1.00mm as I tend to use medium picks and didn't want to go too thick.  But it's a weird feature of the Big Stubby 1mm in that the body is 1mm but the tapered bit is thinner than my medium picks.  So I don't get that flex that thinner picks get, but I get really precise tip control and something just a bit more substantial to hold onto.