I see the DW20 pack as being the balanced moderate choice.
Monster is the full over the top option that directly out of the box might not give the most balanced play experience.
I personally plan on using monster once its stable(I would definitely recommend waiting a bit till the packs are out of beta to start a new world) and then disabling/configuring the things I don't like. It is hundreds times easier to remove things from an existing modpack than it is to add things.
Simple answer, sure its not difficult. Drop it in and it runs.Dropping in a mod or two isnt too difficult, especially with the global configs.