The ease of use and the wide selection of plugins available. Mekanism is very easy to learn and can be used with many different plugin types. No plugins are needed for the most part but if you want more control over your plugin selections than Mekanism has that too. It's not as user friendly as other popular mods such as NBTExplorer so it takes some time to figure out how to do certain things. There are plenty of tutorials online to help you get started but there are also a lot of people who have questions that aren't answered in those. You will need to spend some time learning about Mekanism before you start using it. I'm able to build my own plugins without having to pay for them. This allows me to create plugins that work exactly the way I want them to.
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