These have been on Amazon AU for ~$180 before but it doesn't look like they are listed at the moment.
Edit : PS version on Amazon here for $180.
It is a decent amp as reviewed here and you can use any headset (I currently use my Mixamp with the HyperX Cloud Alpha).
For Xbox Series S/X, game and chat audio can be output using USB (Mixamp requires a firmware update).
PS version here
Xbox Description:
Astro MIXAMP PRO TR
The ASTRO MixAmp Pro TR for Xbox One and PC is the premier gaming audio solution for professional gamers, including esports athletes, content creators, streamers, and game developers. It was developed with esports athletes to meet their rigorous standards for audio fidelity, voice communication, and durability.
The MixAmp Pro TR features Dolby Digital Surround Sound processing and enables lag and interference free delivery of game sound and voice communication to the A40 TR Headset (sold separately). Its simple controls allow for quick adjustment of game-to-voice balance settings, determining how much game sound and voice chat is heard. It also allows users to select 1 of 4 different EQ modes optimized for different game genres, as well as providing master volume control.
The included ASTRO Command Center software allows Pros and Livestreamers to tune every input and output parameter of the MixAmp Pro TR to precisely configure it for their specific setup.
Features:
CUSTOMIZABLE STREAM OUTPUT - Control what your stream audience hears, including chat and game audio levels. Broadcast in 2-channel Dolby Surround Sound.
CUSTOMIZATION SOFTWARE - Free ASTRO Command Center software for PC and Mac users allows the customization of every input and output, as well as the creation of your own EQ settings.
DIGITAL DAISY CHAIN - Faster than the speed of sound, this fully digital connection enables interference and lag-free local voice communications.
DOLBY AUDIO - Dolby® Audio delivers cinematic, 3D gaming audio experience, and broadcasts Dolby out to streaming audiences.Specifications:
Inputs Rear: TOSlink, USB micro-B (audio/power), 3.5mm Stream Output
Frequency Response: 10Hz-24,000 Hz
Power Input: 250mA at 5V
Power Output: 100dB SPL at 125Hz (80% at 0dBFS)
Inputs Front: Headset connector, 3.5mm Aux in, Two digital daisy chain ports
Unless you have 5Ghz Interference with your wireless headsets I don't recommend getting the mixamp.
Why? Well since they removed the optical ports on the consoles you cant use the built in Dolby Digital, and you also cannot use your own custom sound profiles(https://www.thezeference.com/astro-eq) because for some reason they decided to disable them with the USB update. You need to purchase The Dolby Atmos app to make any audio customisations.
For PC this is good and works as it should.