For crawling they are too stiff, I had to order the softest springs they make and lower the oil wt to make it perform, half decent, they look awesome and soak up the bumps, perfect for a rock racer.
http://www.gmade.net/bbs/zboard.php?id=shock&page=1&sn1=&divpage=1&sn=off&ss=on&sc=on&select_arrange=headnum&desc=asc&no=67&PHPSESSID=c14500b6f245d9b35ec95433ed687e25