just to clarify the main differences between, HOps inserts, MESHMachine plugs and KIT OPS INSERTS, both HOps and MESHMachine are primarily built with other tasks in mind, inserts being a feature, not a primary focus or purpose and both HOps and MESHMachine are based on very similar systems that Jacques Lucke pioneered in regards to snapping and aligning inserts.
With heavy discussion and a specific design path from chippwalters and masterxeon1001, We created KIT OPS from the ground up to be the simplest user interaction so far, as close to possible as a drag and drop interaction within blender in regards to quickly dropping booleans, and having those cuts displayed immediately
Neither HOps nor MESHMachine currently immediately perform the cut, both rely on blenders internal snapping mechanisms, and always require and extra level of input by the user, such as pressing G, holding CTRL and after choosing the location then clicking an apply button.
KIT OPS uses a ray tracing solution, never interfering with your current 3d view options and always being nothing more then a couple of clicks; one to choose the INSERT, another to add it to the target object
In addition the toggle options in KIT OPS are incredibly intuitive, allowing for dynamic behavior and visual clarity on what it is precisely that you can see in the viewport and how to work.
KIT OPS also includes automatic selection of INSERTS, which can be any number of objects or object types, intelligently discerning between INSERTS added.
With the PRO version an INSERT file can allow for full drag and drops of the scene you created in the file itself, granted you take the time to set up the cutters (if needed) and put what you want on layer 1, allowing for exclusions, this includes fully rigged props/characters, with immediate animation feedback if desired.
KIT OPS will also automatically perform many tasks as you work in smart mode with mirror and snapping tools available and duplicating (SHIFT + D) immediately creating a new modifier for the new INSERTāS cutter(s), which can be 60 if you desire to have so many in an particular INSERT.
KIT OPS is really designed to be the best at what it does, and with much potential to be had in the future.