[jrz1972]

Going for a check-raise after you PFR is on page 2 of the Donk Playbook (page 1 is The Trifecta). Advantages of the try-for-the-check-raise line include giving free cards that beat you and making it easy for your opponents to dump their hands on the turn after your oh-so-tricky check-raise.

Seriously, when you raise preflop, you'll often be making continuation bets on the flop when you whiff. Your opponents know that, so your flop bet doesn't look scary; they expect you to bet the flop no matter what. A check-raise, on the other hand, is much scarrier and less deceptive than a straightforward bet.