Hi! Yes, I am a Tate Publishing author. They have published two books for me so far and a third is in the process of being illustrated now.
Every person, from my marketing representative to my graphic designer to my conceptual editor has been nothing less than wonderful. They have met their deadlines, been responsive, answered questions, and been encouraging.
Before signing with Tate, I researched them through the BBB as well as viewing comments about them on the internet. Sure, I found a few negative ones about them, but they were outweighed by numerous positive ones.
If you are an author looking to get published, I highly recommend Tate.