I've been a fan of Elixir strings since I got my hands on my first set several years ago and never went back to regular strings.
This polyweb version is nice and warm, which is a pleasant change. I usually get the other, more crisp-sounding strings (optiweb), so I was pleasantly surprised to find that these sound great, too! Get these if you don't want to change your strings too often.
With moderate use (I pick up and play my Strat for a bit a few times a week and record a little in the home studio), these usually last me several months. That's because they don't collect dirt in-between the string-windings like regular strings, meaning you don't even really need to wipe them down all that often (though I still do after every time I play, because it's a good habit). Don't play with greasy fingers ;-).
They're slick, smooth, durable and make playing easy.