Defined Outcome and Derivative Income ETFs each offer attractive features in the form of modified payout or income characteristics. However, these benefits come at a cost of limited upside, and a “buyer beware” approach should be taken to weighing their pros and cons. Sustained bull markets reveal the true impact of trading potential upside for considerable benefits in the here and now. This study attempts to quantify the opportunity costs of capped funds using 2023-24 as a particularly harsh test case.