Friend has a DTUK or similar on his GTD, he had a few issues with the actual box to start but sent it back for repair and works normally now.
In short he loves it, has it on a low setting but gives him everything he wants and dsg box handles it fine. The boxes are good for more power anyway. Obviously a bespoke tune from someone like Revo, APR etc are a bit better but if you want to remove it a box is a no brainer.