I have a few of those Xvive systems ... had 'em for months now, and I love 'em. They also work with line level signal, so I sometimes use them to connect to a powered speaker in another zone without having to plug in. Using the S1Pro, you don't even need a power cord. I have had several occasions to use a single S! on a stand, with the wireless plugin, and place it where it needs to be with no thought of wires, or electricity.
Tomorrow, I DJ a picnic for a local school, and I'll use 2) QSC K-8s on stands, each sending a wireless signal to 2) S1Pros on stands about 50' away from each of them for a quad-like experience.