Agree with Alex, pretty much use these panels for every image great for landscape but also works very well for portraiture, and wildlife. Any time you need to apply an adjustment the masks created in the panel help to target those adjustments. Curves, hue/saturation, D&B, Plug-in results can all benefit from application through a targeted mask. Like Alex I don’t use every button or action and just recently started using the masks based on color rather than luminosity. Sean Bagshaw’s tutorials are really very comprehensive but also easy to follow.They are extremely powerful and easy to use once you understand them. Tony Kuyper has a few video tutorials, but it is Sean Bagshaw that has the best and most comprehensive guides. Very highly recommended. Would not post process in PS without their luminosity masks.
I do not use every button, just as I do not use every menu option in PS. Only what you need.
Sean offers a free TK6 (previous version) basic luminosity panel. A great intro to using Luminosity Masks in post-processing.