One of the not so good purchases ... an electrically operated shower controller. It may run out of power during holidays, in which case one can't take a shower, and the large batteries aren't available in all stores. It also takes several seconds to turn the shower up or down. And the battery holder design turns out to be leaky.
The only good feature of this design is that it does automatically cut off after five minutes, so there's protection against passing-out-in-shower-and-causing-flood. Also, the shower doesn't send data to anyone for better targeting of advertisements. As far as I know.
Photos and text (c) 2019 by Jari Arkko. All rights reserved.