Great for storage, but your mattress will definitely feel different and may wear out more quickly. If you have a high end eight way hand tied box spring (not so common these days) you may not like the feel as they are made to work together. If you have a "foundation" which is different than a box spring and it is saggy, you might actually like the feel of being on a harder surface.
The only way to know what it will feel like is to move your mattress onto a bare floor and give it a test drive. Good luck!