Super nice add-on for sparing a couple bucks when it's time to acquire a new game. I personally use it to compare prices of steam keys for whatever the game is that I'm looking for at the time.
Edit October 10th 2024: My opinion remains the same. I only suggest to improve the discount codes search and auto-add feature, sometimes loads more than once and sometimes says there aren't any codes but still adds one that works to your cart.