If the inside-out tracking on this device pulls from Microsoft's advances they made with HoloLens - which sounds like it is the case - then there's plenty of reason to believe it'll work incredibly well.
People rightfully complain about the HoloLens's FOV, but one thing that no one ever complains about with the HoloLens is in how well it maps the environment, maps AR objects onto that environment, and truly allows those objects to "stick" to the environment perfectly no matter how you move your head around or walk around.
Inside-out tracking is an incredibly difficult thing to do. HoloLens does it on an untethered device based on 3-year-old technology and custom hardware like their
Holographic Processing Unit.
There's no reason to believe that a tethered device like this Acer VR headset will be any worse than the HoloLens - the hardware is years newer, both companies have learned a hell of a lot since the HoloLens first launched, and the device can pull from processing power of the PC it's tethered to.