Yes, you are confusing it with your imagination. Let me make this painfully clear: THERE IS NO SUCH THING AS AN UNDETECTABLE CONTROLLER.
Every mod shop that tells you that their controller is undetectable, is a LIAR, and is marketing this to fool you into buying their product.
With that said, if you are worried about being detected, The Viking is the best controller you can purchase. Why? Because in the unlikely event that rapidfire controllers are targeted anymore than they already are (by a simple speed cap... in the case of Black Ops the speed cap is somewhere under 9.0 shots per second), The Viking can be updated via USB on a Windows PC using the macro software.
For free.
Other mod companies, I guarantee you, will charge you $$$ (and you'll have to ship your controller into their shop, which could take WEEKS) to get any rapidfire code updates in the future.
So to recap, other mod companies lie to you to make the sale, and then charge you $$$ later for rapidfire code updates. Viking charges you one price up front, we don't lie to you, and our software and any future macros are always free!