Yes. I had a dispiriting session today trying to get clean audio onto my new Ursa Mini 4.6. I found using the XLR inputs basically unpredictable and very noisy. They'd cut in and out sometimes refusing to work until I rebooted the camera.
I tested extensively using phantom power, not using phantom power, mic high and low in, line level in, and everything including the headphone jack was atrocious. Mixing phantom and non phantom sources was impossible and would result in audio shut down.
The headphone output delay is worse than most other recorders and the headphone quality extremely noisy. The line level input is overly sensitive and clips with a very low signal coming from my Sound Devices Mix Pre. The mic pre-amps are really terrible, with a lot of hiss and distortion. The headphone signal is somewhat misleading because the recorded audio was a little better than what you hear on playback. Either my camera is a lemon or BMD's audio engineering is lacking.
Overall, BMD gets another F in the audio department. My suggestion: use the onboard mics to record reference audio and make sure you have a good external recorder that can do the job right.