This really does the job, and helps me maintain a more ergonomic position at my computer. Much better than the cheaper ones which either don't give as much support, or start to permanently distort over time. Thus far this one is holding its shape perfectly.
I work in many different places, and was planning to carry this about with me - it's a bit too bulky to do that, but maybe I should have read the dimensions more carefully. It also has a pretty toxic foam smell but, again, I guess that's a personal sensitivity thing!