I used their kit that comes with the roller, the little one in the priority mail box, and it covered my Encores. A little more would have perhaps been more "perfect" from some angles in the light, but it looks good. I had to water it down slightly, and go with two slightly lighter coats. More would be appropriate for bookshelves.
The biggest thing about the rough texture is it likes dust. Also wiping doesn't work that well without water, on the dust. A roller that had a little less texture would be nice.
I'll probably be using it again some day.