As an agency managing many high-value client sites, we can not afford any downtime. Regular security and maintenance updates are a must. The headcount to achieve high-quality service would be much higher if we would not use MainWP.
It is clearly THE solution if you are looking for high-quality code, no bugs, and a stable solution for managing trusted client sites. New features are added constantly. All in all: MainWP is a winner and highly recommended!