Received the filament sensor earlier this week and printed a case (the default one on Thingiverse) in black PLA.
Initial results with the filaments I had to hand as follows:
Currently running a 28 hour print using the yellow PLA and sensor enabled with the current state:
Duet3D laser filament monitor on endstop input 3, enabled, allowed movement 40% to 120%, check every 3.0mm, current position -7.0, brightness 89, shutter 15, measured minimum 78%, average 94%, maximum 114% over 43930.2mm
I haven't yet tried alternative case designs - planning to take a look at that later.
I also have a Prusa I3 mk3 for comparison and my initial impressions of the sensor are very positive.
I need to do more testing of filament sensing and failing along with recovery processes. I do like the way the Prusa will pause, prompt you and eject/reload filament with just a few clicks on the control panel. I am not sure yet how we can define macros to perform similar functions since I think we would need access to the filament sensor state but that is for another day ...