Generally it's better to keep than either the PBT or the Achilles as it's more hardy and seems to do better than both. You need to watch out as they do come down with ich for time to time. They are a little skiddish but are general better to keep than the Achilles tangs and don't have the problems that come with some PBT that make a lot of them die early. Pretty peaciful tang also, unlike either the PBT or Achilles tang, and should get along with other tangs much better. I does get to be a pretty good size so the 110 would need to be upgraded in the future.
If it's eating, and it does look good from the picture, the fish should do very well for you.
It usually goes under the common name of White Cheek tang, Similar ones are called Lolly-pop, Gold Rim and Powder Brown tangs.