After testing the LEVOIT Aura 400S for a month in my 2-story home, I'm impressed by its value proposition but found some quirks worth mentioning. The crisp 4-inch touchscreen automatically adjusts brightness (a lifesaver at night), though I wish it stayed slightly illuminated instead of going completely black during standby.

The simultaneous heat/cool Auto mode is my favorite feature - perfect for desert dwellers like me where nights dip to 40°F while days soar to 85°F. No more waking up to a freezing house because I forgot to switch modes! However, the touchscreen menus feel cramped compared to app control - that tiny font had me squinting until I discovered how much easier programming is through the VeSync app.

Installation was straightforward if you have standard wiring. One tester nearly returned theirs due to incompatible E/O/B wires - definitely check your existing thermostat's wiring before purchasing. The included C-wire adapter worked flawlessly in my setup, though some users report odd HVAC behavior (like double blower startups) that may require technical support.

Where this thermostat shines is ecosystem integration. Pairing it with LEVOIT air purifiers creates smart scenes that automatically adjust purification when the AC kicks on. The room sensors (sold separately) effectively balanced temperatures between my sun-drenched living room and basement office - though at $30/sensor, this gets pricey fast.

The energy reports feel basic compared to premium brands. Filter change reminders use calendar days rather than runtime hours, and that 'cooling malfunction' alert gave me a scare despite normal operation. For under $100 though, you're getting Alexa/Google compatibility and reliable scheduling - just don't expect Nest-level polish.

Final verdict: A solid choice for budget-conscious smart home beginners, especially existing LEVOIT ecosystem users. Tech-savvy buyers might prefer paying extra for more advanced diagnostics, but for basic schedule automation and remote control, the Aura 400S delivers where it counts.