People seem to like them....but there's two versions IIRC. The first is just like the regular SL, but made of the transparent blue plastic. SUPPOSEDLY (this is from YL), the plastic has a tendency to rattle at higher speeds. The other version is a ~35CFM version that spins slower, pushes less air and is probably quieter. May compete with the Nexus fans tbh, just it's transparent blue with LEDs

Both are probably safe bets for inexpensive yet good LED fans