I've had a WiiM Ultra for about 9 months now. It works great. However, the one potential drawback for some setups is that it's maximum output, even when used as a preamp, is limited to 2 volts. If paired with a lower gain power amp you may find the maximum volume limited, especially when playing material that was recorded at a lower than normal level. By comparison, the Schiit Saga 2 preamp shows a max voltage output of up to 10 volts. However, as noted, the need for more than 2 volts from a preamp is system dependent. My setup works fine.
