This is a huge time saver, it's so handy to save node groups this way. Why it's 3 star, is because of the current implementation is very tedious. User needs to manually open and append the template file.
I've actually made a custom version, which uses part of edit linked libraries to automate this processm I've also added a category system so you can filter different node group types.
i agree with the other person that it could be better, but it works and i don't really add new presets that much