It is my opinion,that the Alchemy synth is not a program that is up for debate,whatsoever.The sound quality is brilliant,the sounds are very deep,lush and thick and the vastness of it is impressive.
It's also very well organized,unlike some programs that have labyrinths of endless editing sub-menus that appears to be in Mandarin Chinese.
It's an incredible value and it is a wonderful alternative to Omnisphere,if you're on a budget.If sample-based synthesis is your game,then there is absolutely nothing about Alchemy to disappoint anyone.
-Thom