My experience: Equifax. Fairly quick but seems to be able to deal with only one problem at a time. Two problems in the same letter really throws them. Will eventually solve all the problems but it takes a long time. TU - resolved all my problems with one letter but took longer than Equifax. Experion - takes forever, especially when it comes to sending out the credit report to get the process started. Can resolve more than one problem at a time but probably not more than two. Smarter than Equifax but not by much. Based on my experiences, I would recommend only one dispute per letter. Make it real simple because we are not dealing with bright people. My overall impression is that these are people who could not find a job elsewhere. What are your experiences? Based on my comments, I better proofread this before posting it.