I was given one by an older woman who used it until she upgraded her sewing chair. Just a basic office on wheels.
I didn't like it...at home I sew on an actual sewing machine chair from the 50s or an old dining chair, until I got the set up at my shop for an industrial overlocker, SS, my saddle treadle, the 99 as a buttonhole machine on an old sewing desk, a Davis treadle and a Janome for the zigzag in a table. They are set up like an L, (OL, SS, 99, Janome, saddle machine, Davis even feed) and I roll all over the place from sewing machines to ironing board..etc. Now it's important to have it.