Taking insurance in blackjack is generally not recommended because the odds don't favor it. The bet is based on the chance that the dealer has a blackjack, but the 2:1 payout doesn't compensate for the probability, making it a losing proposition over time. Unless you're counting cards and have a good reason to believe the deck is rich in 10-value cards, it's best to decline the insurance and stick with basic strategy for the main hand.