They can be really tasty, but I think it’s all in the batter. The meat itself does not have much taste nor texture. Which means “trying” them may only tell you the preparer’s style.
Others may have different input, this is just my theory. I’ve had Rocky Mtn Oysters prepared by maybe 4 different cooks. They varied, but in general were good to quite good.
A bar outside of Stillwater, Oklahoma has an annual multi-day affair called The Testicle Festival. Thousand attend and eat the oysters. They are fine, but nearly everyone agrees that they are best served with a cold six-pack of beer.