"i have a capisco puls with fully upholstered seat. it is a very flat seat design so once my postural muscles give out i end up slouching as the back rest is too far away to support me when sitting in a perched position near the front. this workhorse saddle chair's seat is sloped up at the back to support your pelvis from rolling back and slouching. i also feel discomfort in the groin area when seated with my legs at a 45 degree angle, unless i am leaning back. the main problem that some people could have with the WSC is the lack of a backrest height adjustment to accommodate larger users. and the ability to move the backrest closer to you."