The fact that we experience what is being fed to 'us' by the various hardware devices, and not reality itself, is not controversial. The question is, what is the nature of the 'experiencer'?
The experiencer is the sum of your body's processes. It's what it feels like to be your body. To be connected to all your parts. To have been raised and taught to react, to have instincts and decision making circuits based on these. It's a material thing. Vision is the sense of eye, thought is the speculative sense of sensing, etc.