I've done some light schematic building lately, and this mod is by far the easiest and most effective method I've found. It's simple and convenient to use, completely mod/game agnostic (a must for development outside of MTG), and offers reasonably polished presentation.
The only features that feel like they're missing is an option to load schematics registered by mods and a quick way to swap or flood-fill nodes in a schematic, but these are easy to work around or provide externally anyway. Overall, this mod makes for an incredibly useful development tool.
and a quick way to swap or flood-fill nodes in a schematic
I intentionally did not provide tools for that, this mod is focusing on schematic importing and exporting. For the editing the world itself, you should use other mods like WorldEdit. There won't be powerful editing tools in this mod as this will a) make the mod more bloated and b) will clash in functionality with other mods like WorldEdit. That having said, there are two very basic replacement tools (replace air with schematic void and vice-versa) and that's it.