I found this link while searching for pictures of drogmors...
http://images.google.com/imgres?imgurl=http://www.eqsummoners.com/eq1/images/blackdrogmor.jpg&imgrefurl=http://www.eqsummoners.com/eq1/horses-library.html&h=175&w=284&sz=8&tbnid=3askBak0hC4J:&tbnh=67&tbnw=110&hl=en&start=2&prev=/images%3Fq%3Ddrogmor%26svnum%3D10%26hl%3Den%26lr%3D
It answers questions on speed comparison, cost, benefits, spells while riding mounts, and pretty much anything else you can't find here ;p Have fun!