Do timers create satisfied customers?

As an e-commerce business owner, I'm curious about the psychological impact of countdown timers on customer satisfaction. I've seen these timers used across various websites, but I want to understand whether they genuinely enhance the customer experience or potentially create negative emotions like pressure or anxiety. Are these timers perceived as helpful urgency signals or manipulative sales tactics? I need concrete insights into how different customer segments react to time-limited offers and whether these strategies truly improve overall customer satisfaction and conversion rates.