Any experience with the Aqara U400 Smart Lock?

Anybody have experience with the Aqara U400 smart lock? We got the U100 about a year ago and it’s very buggy. We’ve decided to replace it because it’s gotten too unreliable. The U400 seems like the best on the market right now (from what I can tell) but my experience with the U100 has left me skeptical of Aqara stuff.

Jason Snell (Six Colors) has one and reviewed it here in March 2026.

I installed it about a month ago and it is amazing! No key needed anymore. I have a family of four and it has been flawless since install.

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I really wish this would work with my door.

UK doors, especially for newer houses, tend to be UPVC with multi point locking systems, not a single deadbolt.