I have used GHS coated strings, boomers, DR non-coated, rotosound, and on and on and on... these black beauties are the best.
They don't have nearly the same deadening effect on your tone that most coated strings have. The tone stays consistent for weeks instead of days, and it's warm, punchy, and articulate. Plus, the coating gives you a great slick playing surface on the fretboard and reduces nasty string noise.
It's a VERY NICE! Number one string in Kazakhstan.