I've got a ~5" GoldFlake for maybe a year now. It has been a great citizen for me in my sps tank. Within the last week, I added a piece of Superman Zoa's to the Main tank and it doesn't look as if either the Regal Angel or Goldflake has touched them.
Remember, with any Angel, they are Hit and Miss with lps, Zoas, Clams ect...
As for price... listen to flameangel!!! Spot on!