I don't have it on an LNL but I have 2 that I use on my Pro2000.
I like them a lot and they work. You just have to adjust them to your correct load each time. This requires that you have to adjust the die in and out, so I put lee lock rings on mine. Next you will find that there are 2 "feet" that sample the powder. One for less then 40 cal, and one for over. I find changing them a pain, so I just have two of the dies. I changed my setup so now every round gets a lockout check.
It does work and you can tweak it to detect just lighter then your spec, major screw ups like no powder or just heavier then your spec. You cannot have it do all of these at once.
I generally set mine to go after missed charges and light charges. I try and load so that overcharges will fill the case and spill.