I have 7 damsels. 3 Talbot, 3 scissortail(Neopomacentrus bankieri), and 1 lone blue chromis in my 40B. I love them all.
I originally bought 5 scissortails, knowing one was iffy on making it since it didn't look too healthy, but wanted to give it a chance. Eventually I was left with 2 males and 1 female. The two males are huge, beautiful with long streamers, and have a slight iridescence to them. The female still has a lot of yellow and is about half the size of the males. She spawns with one of them every month like clockwork. Very personable and active fish.
The talbots are my absolute favorite. The coloring and shape is great. They are very active. The main thing I didn't realize is that they are burrowers. They burrow more than the sand sifting goby I used to have. For such a small fish, they move a lot of sand and rock. Even if you hate damsels, this is the one damsel I would recommend everyone keep. By far the easiest and most fun, in my experience. Aggression is very minimal and they don't fight with other fish. Watching them burrow and then the other fish come and see what all the fuss is about is great. My melanaurus likes to follow them and grab a quick meal when the sand starts to fly.
The lone chromis is the only remnant of my attempt to keep blue chromis years ago. I don't recommend people keep blue chromis as they are like anthias and require a lot of food. They aren't very good at competing with my other fish either. They need the constant supply of food in the water column to keep them fat and happy. Don't like large particles. Prefer the small planktonic size stuff. If you can do that, then you are golden. If you are the type that is afraid to feed your tank more than once a week because it might cause an increase in NO3, then don't keep them. I think chromis would do great in a NPS tank where phyto and plankton is being dripped in constantly.