1) They last. Good tone, take a beating, stay in tune, don't break as quick as others...by a long shot.
2) Do you need a 2??
I have coated bronze on my 6 and 12 string acoustics and I recently acquired a new Fender Strat with some standard strings on it. I liked the strings fine enough but decided to try to NYXL strings. They are deluxe and amazing, but my fingers, over 20(?) years, have grown accustom to the half rounds and so have my ears. It's just not right without them.
So here I will shop, forever, as long as they keep making them.
D'Addario...if you ever decide to stop, contact me, and let me buy the last batch. I don't want another, ever.
Unless you do NYXL's in half rounds...
as an experiment i strung the electric EHR310 onto an open tuned 585mm short scale acoustic with a naturally very good projection. F - Bb - F - Bb - D - F tuning and i am extremely fond of this one.
there is a lot of give in half rounds and they stay bright, because there is no gunk building up in the winding gaps to dull the sound. a little hint before putting on half rounds: it's a good idea to pull each string through a rag with metho twice along the length. this will get rid of sticky residue left behind from factory grinding. this is the only minor point i would like to put to d'addario. otherwise: best strings !
I use the 10s on my standard scale Fenders, and 11s on my short-scale Fender (24") and PRSi (25").
No issues with wear, though I don't play out.