...in your review you mentioned that you couldn't hear a difference, which was reassuring.. however, now your saying it can make a difference.
I don't recall hearing any significant problems, but I've heard and read many user reports subsequently that others have noticed some differences between the unit on its own and when used with the remote. As I said, send and receive impedances will have a big affect on the cable losses, so you really need to try it with your own equipment to access whether the difference is significant in your application or not.
He mentions that the Monitor Station, being active, has a slight lack of detail and 'veiling' of the sound compared with the direct signal.
This is inevitably true of all budget monitor controllers to some degree. That's why the very best -- the most transparent -- cost thousands not hundreds. But whether any veiling is significant in your application -- or even audible with your monitors and your room acoustics, only you can decide. Bear in mind that MW was probably using his ATC monitors in a very well set up room.
Now, I'm not sure what to do.
If you know the Monitor Station, it has the facilities you require, and you are already happy with the sound quality, what's the problem? Go for it! You'll need to spend considerably more to get better.
Technical Editor, Sound On Sound