The older AXS MTB products shift well, but the clutches are very weak, and with the extra weight of the mech, result in a considerable amount of chain slap, but it is very reliable, if you can put up with the noise.
The newer Transmission AXS is considerably quieter. However, in a bid to make the mech body indestructible, the lower cage is now sacrificial & remarkably weak. On the XX/XO mechs the amount of bent lower cages from very low impacts, is shocking & becoming a real issue for SRAM.
They are selling the bare GX steel lowers for ~£30, which have proven to be more reliable than the higher end parts.