Could developers or traders who have created Automated Trading Systems (ATS) using the T4 API share their experiences on the: (i) reliability (ii) user friendliness (iii) functionality (iv) speed of the T4 API. Any info on experiences with T4 API are much appreciated. Also any comparisons to the CQG API or TT API or IB API or Rithmic API by anyone who has used BOTH T4 API and any of these other APIs will also be appreciated. Please share your experiences and insights. Thank you.