I don't have TradeHawk, but I do have ONE. I'm not sure if they are comparable in terms of functionality. ONE is more comparable to OptionVue, but I believe that OptionVue is much more expensive. To me ONE is a must have tool for any serious trader, and I'm very happy with it (full disclosure: I'm paying the same discounted price as the rest of SO members and don't get any compensation from ONE for recommending them).