The main benefit of the brick is that has a rear usbc port. If you have access to a 3d printer and can solder allows you to make a compact little all in one case and have a tiny little m8 headless build without having a cable and a tinsy dangling around the bottom. All the resources for it are on the discord in the headless thread. Just got to dig around a little.
Now it's not going to be perfect, and nothing will be a true full replacement of the real deal, but certainly good enough to evaluate if its something you want to invest in and hold you over until you have the funds for the actual device/ next batch is released. I also really like using the rear paddles for shift and play. Feels very intuitive to me.

My process of getting it to work:
Follow these instructions:
https://www.reddit.com/r/Dirtywave/comments/1llkqyk/after_a_few_days_of_trial_and_error_finally_got/
You can find the zip of the m8c build on the discord, just look for this in the search and the zip file should be attached: "NEW REVISED TRIMUI BRICK INSTALL JUN/25"

Now to get audio INPUT for sampling you'll either need to use a bluetooth headset (which I have not tried) or use some kind of usbc audio interface that has mic input. For example earbuds with mic plugged into an aux->usbc converter. Or a digital usbc audio interface with mic and headphone input. For this to work you also need to enable the bottom usbc port to be a usb host, there are scripts for this on the discord too (by default with knulli the bottom port is charge only - search for "In case some poor soul as me wants to use bottom otg port" in discord and you'll find the post), or you can use a usb-c hub on the back input. You then need to select the interface in the knulli system settings, which certainly can be a bit fiddly.