The way I see it, it’s 200 euros for something technically interesting. Technically interesting things are my hobby. The day I’m bored with it, I can always remove it. No biggie.
So it all comes down to whether a 200 euro one-off is too much money for the fun or the service it provides to you.
As a product, I’m on the fence with that one: the promise of being able to read your temperature with any old cellphone isn’t totally fulfilled: you need a special app and you need to train it, and you need a cellphone with a healthy enough NFC frontend to actually read the damn thing. And the way the app is setup, on top of that, you need to log in and it needs an internet connection and yada yada - which is utterly ridiculous.
In other words, it’s only mildly more useful than a LF Destron Fairing (aka DT xBT) that requires a dedicated reader, because I happen to carry the BeUno’s dedicated reader around with me anyway (my cellphone). Other than that, the Destron Fearing has the upper hand in my opinion.
But… the BeUno provides good amusement value to me, and I don’t have children waiting for their inheritance money. So 200 euros is worth it I reckon.