I have the 12x12 rotating mat and aside from the fact the black back came off, I just put it back together - it is basically a lazy-susan.
I use that and the (my) new 18x24 virtually anywhere - in the sewing room on the table, desk, ironing board - - and downstairs on the dining room table if I have a project down there - - - and yes, I have a 24x36 but that stays upstairs on a dedicated cutting table. You don't always have to cut on them, sometimes they are handy if you are drawing a design, all kinds of stuff - the visual measurements work a lot to your favor.
Marysewfun