Who here has had success with regression therapy?

I've been studying various self-improvement topics for years, so you'd think I'd be a master at it by now right? Not quite. What I recently learned about is a very interesting process commonly referred to as regression therapy. Most new age self-help advises on staying focused on the now, and forming new beliefs to gradually overwrite old ones, whereas regression therapy is process of re-visiting past events or feelings more specifically where your limited beliefs originated from, and then re-framing with a new version and new feeling. Some report results of instant breakthroughs. I've recently started some exercises with this, and must say... it's been pretty enlightening. Would love to hear other's experiences.