Seamlessly Migrate and/or Stage WP Sites

1.) Extraordinarily well-written and documented, including the free version.
2.) If the Pro version works as well on large multi-site installs as the free version does to replicate, migrate, and set up staging for single sites, it would be worth the money if you are developing in that large-scale space.
3.) The instructions are there for a reason. Please read them! FOLLOW them!
4.) No complaints at all; I would use and or recommend again in a heartbeat.

TIP: If you are trying to create a staging site, I would highly recommend an article you will find in the Tutorials section of the WPBeginner blog.