Just from looking at it, I don't own one. I wouldn't like having to reach over my machine to get to stuff.
I like a lot of room behind my machine for the bulk of a large quilt. If you only work on small quilts and only a few supplies it might work.
The single leg supports don't look very sturdy. The surface won't hold many tools as you are working and have a lot of fabric on it too. I keep stuff like thread clippers, small cutter and mat, pencil, glue bottle and small iron with pad close to my machine. My foot or chair would bump those tables once and it would be all over.
Not practical for storing fabric.
IMHO, I would only invest in this cabinet if I were a very casual quilter and didn't use it much. The price would keep me away from it.
This is my observation from just looking at it. Might be great for scrapbooking or jewelry.