I use (and have passed) since last year, both in my power that my folk.
I love the rich sound they provide (with a mention for acoustic + +), and especially in a sustainable manner. I tend to sweat a few hands and thus quickly rust! With these strings do not think about it a wipe with a little bio degreaser from time to time and it's happiness for long.
They have only one flaw: new, they slip under the fingers and this gene for the bends. Past few weeks, they "make" and everything falls into place. -1 For this but it really is to quibble.

The price is forgotten, the quality remains!