After returning the first faulty unit (signal intermittently dropping out), I was apprehensive about the replacement but this unit has been 100% reliable at rehearsal and on stage for over year, at time of writing. It's easy to use and set up and very neat. The transmitter plugs into guitar, the receiver into amp and you're ready to play. No wires or aerials. The Xvive wireless unit comes with a usb Y-split charger cable allowing both units to be charged at once. According to the documentation, a charge should last around 5 hours which is plenty for a normal gig. The batteries aren't replaceable but should last several years so, at a very competitive price, if the batteries go, I'll probably just buy another unit. The only annoying omission is that it doesn't come with the mains/usb adapter which is needed for charging.
Overall, it's a neat, reliable, cost competitive wireless unit.