Is a whole-home shutoff valve like Moen Flo worth it over a $20 puck?

Reviewers across the tech press and plumbing-focused subreddits generally say yes for homes where a slow leak could cause significant damage (finished basements, multi-story homes, vacation properties), but with caveats. The Moen Flo and similar valves monitor flow continuously and can shut water automatically, but specialist-subreddit threads also flag long-term reliability concerns and a higher install cost. Pucks only alert after water has already pooled.