Bit nervous about buying this having read some adverse reviews on here about a lack of harmony and older artists recognising the signs and knowing when to give up, but all I can say is that those reviewers should perhaps approach their local health professional and request an investigation for the condition known as "Cloth Ears".
Emmylou's voice is different, its not better or worse than it was twenty or thirty years ago, its just different. She's on a lower register, but still capable of a wide range of material (I'd love to hear her try a few slow Blues numbers). She is the finest harmony singer of her generation, just look at some of the artists she's worked with, Dylan, Orbison, Parsons, Young. I always think that if she sang with me she could even make ME sound good (and that, believe me would be some achievement!)
If I were an Amazon salesman, I would be writing "If you liked "Raising Sands", you'll LOVE "Old Yellow Moon". It has a similar wide-range of material, upbeat, standard Country, Rockabilly, ballard, and a very sad, wistful song "Back When we were Beautiful" that could bring a tear to the eye.