Very, but you have to be patient. It seems to take around 18 months for the market to catch up with reality. It is really hard to pick when the market will turn, so I just buy and hold until it does.
What does “very” mean? Do you mind quantifying that with a percentage? As it stands it doesn’t really answer the question: “very” is an imprecise measurement.
How would giving an example hurt? You've given away your strategy, a specific example of one of your successes wouldn't hurt you as they'd have recovered their stock price now.