Interference is inevitable with wireless technology. I experience it with my WaveBird occasionally, even within a few feet of the Cube. The WaveBird is far from "perfect," as I consistently hear it labelled. That said, for me it's too convenient to consider using wires when not necessary. If they make significant improvements to the already very good performance of the WaveBird, I would expect them to make wireless standard. They could still provide tethered controllers optionally, if they're going to still have ports for alternative input methods from current and/or next gen peripherals.