Just checked and it's post 514 in this thread.
Compared to the Ally directly it is a substantial performance uplift as expected. Performance is around a desktop 3070 albeit without the VRAM issues that have been dong the rounds (16GB vs 8GB).
I have a 7600/4070 Desktop so its more of a nice to have but is awesome from a docking perspective.
Only major downside is the XG mobile itself can be quite noisy if you don't set custom fan profiles. Would love if Asus just licenced the XG mobile interface so a "normal" e-GPU enclosure could be made to fit any normal desktop card. You would still be limited by the interface of 8x PCI-E 3.0 but its a sizable jump over TB4.
Just ensure you enable and disable the XG mobile before undocking the Ally. It should enabled automatically when the Ally is on and the drivers have loaded but you need to manually disconnected the XG mobile at a software level before you physically remove it. Not doing so can cause issues.