For virtual reality, Oculus or Vive external sensors definitely offer better tracking.
Reviews are mixed for this product.
$799 @ Harvey Norman
The Acer Mixed Reality Headset has dual 2.89" LCD displays, each with 1440 x 1440 resolution, for a total resolution of 2880 x 1440. It has a field of view of 105°. It has a built-in 13' Y-cable that has a USB 3.0 and an HDMI 2.0 plug to connect to your computer. You'll be able to move around without any additional external sensors. Please note that the Windows 10 Fall Creators Update is required.
I have this setup. For $200 that is really good value!
Highly recommend it
Tracking is smooth and resolution better than vive and oculus. Great because you don't need extra sensors to play games.