Prop Firm Spreads and Execution Quality - What's Your Experience?

Been diving deeper into the various prop firm offerings lately, not just on the challenge side but specifically once funded. A consistent concern I'm running into, and something I'd love to hear others' takes on, is the actual live trading environment.

Many firms tout competitive spreads, but I'm curious about the real-world experience, especially during volatile periods or on less liquid pairs. Are you seeing consistent slippage? How about re-quotes, or even just noticeably wider spreads than advertised when you're actually in a trade? I understand every firm has its own liquidity providers, and there's always going to be some variance, but I'm trying to gauge if certain common practices make it inherently tougher to manage risk and execute precise entries/exits once you're funded. Any anecdotes, good or bad, about execution quality and how it impacts your strategy would be much appreciated. It's a critical factor often overlooked in the initial excitement of passing a challenge.