I use a wool mat at work...and yes love it.
At home I have made mini mats with some washed wool fabric...layered it with three layers, sewed them together around the outer edges. It made about a 3/4" thick pad. I then took a lightweight wool gabardine and made a "pillow case" for it. I love it on top of a small wood ironing board next to my machine when I sew my small blocks together. I have another small ironing board that I layered with about 3 layers of washed wool then put a cotton cover on top of it. My next step is to put several layers of this washed wool on top of my MIL's old wood ironing board. I personally think the hard surface is as important as the wool.
Yes go for it. I'm also a believer in upcycling..we do live on a planet with limited resources...