I’ve used it to run a modest list of Skyrim mods (100ish), and it worked pretty well (although Requiem was very difficult, and I ended up not being able to fully install it). There is a bit of a learning curve, and the wiki provides a decent introduction. It doesn’t cover every single use case but is enough to get up and running. No virtual file system like MO2. It makes a directory for all installed mod files, then drops those into your game files when the mods are deployed through Limo.