wondering if anyone has actually sat in / used the embody chair? if so, how is it? and on a similar note... i'm looking for a new chair, but the condition is the back has to be somewhat solid. when i'm trading, i'm sitting a bit upright...so a concave back isn't good for me. in fact, what i've done is put one of those oversize throw pillows against the back of the chair, so when i'm trading, my back is comfortably against the pillow, which is against the chair. any suggestions? and will the embody help with something like that? thanks for any suggestions, etc. EDIT: i know the embody isn't out til 2009.