I got an HS110 several years ago which has been working fine. I used to not have to log in every time, but now I do. Very annoying.
I just got an HS105 which was 'interesting' to set up. The setup card that came with it and online directions are too vague at some points and missing critial steps. I had a very strong connection to my router, and there were several TP-Link smart plug listings in available networks. It makes no mention as to which one / how to identify it, nor does it indicate that we have to actually connect to that - rather than to our WiFi router. Spent an hour on the phone with tech support and finally got it working. I asked about having to log in every time now, but he kept brushing that off.
The box says that it that the hardware is version 2.0. The Device Info in the Kasa app says it is Harware Version 1.0.