Pros: These fans are inaudible. I could not hear the ambient noise in my house. I would have to have it literally in my ear to hear the wind blow by my ear. VERY quiet. Con: it doesn't seem to move as much air as the anvision YDM4010B24. That fan is not nearly as quiet - easily twices as loud, but less loud than the stock hotend fan. I'm pretty sure orion makes another version of the 4010 axial fan that is tuned for more static pressure / airflow and IMO if these can be sourced they would be a better option for the hotend. Conclusion: The anvision is staying on my hotend for now, as I have an enclosure so the noise isn't an issue. This fan is 100% going on the electronics box because that fan is NOISY AS ALL HELL and this is an excellent option as a replacement.