Well a person after my own tastes. I have a Passer (alias King Angel) that I bought as a large Juvenile last October and it has been a fine fish after a short bout with Ick. Now here is what I can tell you about them;
It is a sponge eater so make sure you get some Frozen Cubes that have Sponge material to feed it (I feed mine every other day that food) Mine likes Frozen Formula 1 & 2 Cubes diced up , live and frozen brine shrimp, frozen mysis shrimp, small pieces of Krill and Squid, Live Blackworms, and Romaine Lettuce (can you see I spoil my fish something awful).
They should be the last fish in a tank as they become aggressive to any new arrivals.
They can grow to 15 inches and a min 60 gallon tank is suggested (mine is in a 65 gal)
My book says it is rarely available and expensive. Now around here I see them from time to time so rare maybe not, expensive- you bet your bippy they are.
Salinity; 1.021 to 1.023 temp; 78 to 81 degrees
Hope this helps I love mine and it was worth the money in my mind. By the way mine is with the following fish Sailfin Tang; Spotted Hawk; Oriental Wrasse; Cleaner Wrasse.