After using the SONOFF S40 Smart Plug for over a year with 8+ units in my home, I can confidently say these little guys punch above their weight class. The real-time energy monitoring feature is a game-changer - seeing my coffee maker's vampire power drain convinced me to put it on a schedule!

The eWeLink app feels surprisingly polished for the price point. Creating sunrise/sunset automations for my lamps took seconds, and grouping all my Christmas lights under one control saved me from crawling behind the tree. Voice control via Alexa works flawlessly - "Alexa, turn on the air purifier" never gets old.

Where these plugs really shine is reliability. Unlike some smart plugs that randomly disconnect, my oldest SONOFF units have been chugging along for 16+ months without issues. The physical button is a nice touch when you need manual control during WiFi outages.

Now for the reality check: The 2.4GHz-only limitation stings if you've upgraded to a 5GHz-only network (like one frustrated reviewer discovered). Setup requires temporarily switching your phone to 2.4GHz - not hard, but an extra step. Also wish the energy reports allowed custom billing cycles for international users.

For under $20 per plug (in the 4-pack), you're getting HomeAssistant compatibility, robust scheduling, and energy tracking that rivals plugs twice the price. Just make sure your WiFi plays nice with 2.4GHz before buying!