for Lumin X1 owners....how good is the unit as just a pure streamer?

Given that the X1 has its own dedicated power supply, it should have a higher performance on the streamer side than the U2.  FWIW, the U1X with same outboard power supply as the X1 is still considered Lumin’s best dedicated streamer.  

To update my earlier post, Lumin just announced the U2X as their new flagship streamer.  This looks like it has the same X1 power supply that was previously used in the U1X, but now supplementing the U2 model.