After a back injury that's taking a long time to get better, I'm beginning to think that I need a thicker and more comfortable SIM, and I'm wondering whether to splurge on a Dozer. Apparently the version for sale at the moment has different material (easier to clean than the peachy fabric, but I'm not that bothered about keeping it pristine, and would rather have something I don't slip off). Has anyone tried the new edition? (think it's called Chimera) Or the older one, and how do you rate it? Is it worth £60 ?