I bought the Smart Lock Ultra a few weeks ago.
The Ultra doesn't go on top of your existing cylinder like the older Nuki models. It comes with its own cylinder, made by m&c (Dutch, SKG*** rated). You can adjust the length, so you don't need to measure your door or order a specific
size. I set it to the same length as my old one and installed everything in less than 20 minutes. No drilling, no locksmith. My old cylinder was a Lince, so for me this was also a security upgrade and not only a smart lock.
The keys are the annoying part. The profile is patented, so a normal hardware store cannot copy it. You order the copies online with your security card, and they cost 28โฌ each.
I ordered 3 and paid 84โฌ. Keep that in mind if several
people live in the house. They arrived in 3 days, which is ok, but order them when you buy the lock and not later.
I use it with the Android app and also from Home Assistant with Matter over Thread, so everything stays local. No cloud, no bridge. Auto unlock when I get home is what I use the most.
Battery: installed on 24 July, it has gone down 7% in 3 weeks. At that rate it should last around 6 months, but 3 weeks is not enough to be sure.
It is expensive, and the 28โฌ keys don't help. But you are also paying for the cylinder, which on its own is not cheap. For me it was worth it. If you only want to open a door from your phone, there are cheaper options.
More Nuki reviews