This may be a wise move; as others have intimated elsewhere, slate is a wide description of a stone, much like the word 'granite'...both can mean widely different things to different people, but the common, everyday term is somewhat misleading. Slate is OK for a shower - but only the best kinds of slate, from nearly where I am. Even then, maintenance becomes a huge issue that may people overlook...
If your budget is unlimited and you have the occasional help around the house to do the daily maintenance on your $25,000 slate shower, then go ahead and enjoy yourself. But most people don't have those assets to put aside just for cleaning your body in the morning, so the better route for those pople is exactly the one you chose.:thumbsup: