i have an achilles in my 125 fowlr, for one, they like very high flow thats why many keep them in sps dominant tanks. and as stated they dont ship well so getting one directly from the source would help on that a ton. so instead of the collectors shipping it to the seller, then being shipped to you, you get it shipped to you directly from the collector.
but i have to say once established in a tank the achilles is no more difficult (or seems no more difficult) than any other tang you will keep. you just have to build the tank around the achilles.