What you have heard is true. Waivers can be issued on the spot or in very short time at Brooks, depending on the type of waiver you are trying to get. I believe Brooks is the medical headquarters where all medical waivers are approved, to include the waivers that are requested for pilots air force wide. Bottom line is, when you go to brooks you just gotta have faith that you will get through it. I know of three people personally that were DQ'd at brooks with eye issues.
Good Luck