I had been playing with normal strings (sometimes Martin strings, sometimes D'Addarios, sometimes whatever was available at the local shops) for well over a year, and started to notice that my strings just oxidated super quickly, and I needed to replace them ridiculously soon, and I hated it, because it costs a lot of money in the long run, and is annoying and time-consuming to replace each time. I play an awful lot each day, and I think my sweat from my fingers is super aggressive or something.
Anyways, I changed to NYXLs once, and I will never ever go back! They've changed my life for the better!
Now I can leave them on for 2-3 months without them needing to be replaced because they are corroded or something. I can play all kinds of styles on it, without them ever breaking, rusting, or anything alike. Heavy picking attacks (even on the high E string (trying to play fast, or chugging and riffing wildly)) don't bother them, slapping like a lunatic (because it's trendy lol) on them either, and downtuning 1 1/2 steps and then bending the strings like a maniac (1 1/2 steps or even 2 steps at times) are not a problem at all. What a fantastic product!
Buy it once, and be glad for the rest of your lifetime that you made that decision! Seriously, it's so good! (in my opinion though)