I tried it in mono sounded good to me, but I am not to familiar with John P so I really can't compare the sound I am getting to his 7ms delay trick.  I do know  when I just have the amp on with the 7ms delay set to 100% wet there is no latency when I pick a note and hear the note.  With both amps on I can't really hear much of a difference then when the TF is in bypass.  I set to 28ms and I actually liked it more than the 65ms (not so much of a slapback sound) that I saved it to a preset.

Good Luck,

A