Coming from a Xiaomi doorbell that worked whenever it wanted, I chose the 2K and it did not disappoint me. First of all, it works FLAWLESSLY. Let me say it again; FLAWLESSLY! It has a built-in battery that, based on my front door (apartment floor), can last for over three months. It charges with a micro USB like a mobile phone and you don't need to invest in rechargeable AA batteries, etc. LIVE VIEW at any time, even if there is no motion. Settings, automations, and various other features from the eufy security application. On the indoor unit, you can add other products from the company such as cameras and work within this ecosystem. Free cloud storage without subscriptions. Instant notification on your mobile phone. Needless to say, the image quality day and night is impressively good. You can play with the voice response, for example, have your child say "who is it?" and your voice will be heard after you have recorded it. A 15-degree tilt adapter means it can be placed in a corner. I have no words. Of course, I will also invest in the company's cameras. As a negative, I would mention its price, but we have seen the cheap ones... It is worth investing in the security of your home.
Update: after 1 and a half years of use, it works perfectly. Battery charging every three months! One of the best purchases ever!
As a disadvantage, I would mention the fact that it operates on 2.4GHz Wi-Fi and not 5GHz. My 100Mbps VDSL gives me 17Mbps and 97Mbps, respectively. I can imagine how instant the notification would be if it worked on 5GHz. But still, it works just fine.