Are cheaper no-monthly-fee alarm systems worth it?

Budget DIY kits like the tolviviov and OSI systems attract buyers specifically to avoid subscriptions, and they carry solid review volumes. However, they show lower average ratings (around 4.2 to 4.4 stars) than the major brands, and the supplied data lacked independent testing, so their long-term reliability is less corroborated. They suit cost-conscious self-monitoring use rather than households wanting professional dispatch.