The ability for me as an individual trader/investor to be able to trade multiple stocks at once with ease of use. I have been using this system since it was first released back in 2008. It has always worked flawlessly! No issues here. If there are any problems they will get fixed quickly by their team members who seem very dedicated towards customer service. This software allows my clients to see all trades executed over several different accounts through one platform so we can keep track from anywhere via our mobile devices.