Once I click the button I've already decided. If I am surprised by something after I click that would have impacted my decision to click it in the first place, I get very upset for being tricked like that.
As an example: I recently bought a piece of software for my new Mac that I had good experience with some years ago, only to find that it's not compatible with the newer models. Upon contacting support about it, this is a known issue with a whole support article written about it. However, it wasn't mentioned anywhere on the landing page or buy pages. They're working on a beta that will warn you (still after you've already installed the software) if it's not compatible with your machine, but again... if I had known this I would not have purchased in the first place. I feel tricked, and upset. This is the same type of feeling.
As an example: I recently bought a piece of software for my new Mac that I had good experience with some years ago, only to find that it's not compatible with the newer models. Upon contacting support about it, this is a known issue with a whole support article written about it. However, it wasn't mentioned anywhere on the landing page or buy pages. They're working on a beta that will warn you (still after you've already installed the software) if it's not compatible with your machine, but again... if I had known this I would not have purchased in the first place. I feel tricked, and upset. This is the same type of feeling.