I picked these up during my quest for the perfect pick, as I had long since considered that nylon is the perfect material and 1.2mm is approximating the perfect thickness, however the end result on these particular picks is not as perfect as I imagined, due to the overall shape, which does not distinguish them that much from your average 351 pick, or tortex for that matter (which I am personally not a fan of).
The main drawback however is the texture, they are not very grippy at all, quite slippery, and this is a dealbreaker.