The standard megaraise derives much of its effectiveness from the benefit of acting first after the flop, and therefore can be done with a surprisingly wide range of hands. The reverse megaraise is done in position, yet also done with a much narrower range of hands. The reason is because if the raise is called preflop, you will be going to more showdowns, since any caller(s) will often have the option of stealing your play and betting into you.
I am not asking you to take my word on its effectiveness...you are going to have to take a leap of faith and try it on your own. Just be advised: when it fails, you will look (and probably feel) like a moron. However, even when it works and you squeeze out additional chips, you will still appear as if you had grossly overplayed your hand, thus still looking like a moron. The upside of this is that few people will be able to figure out what you are doing, making them less likely to copy your successful new tactics and increasing the overall longevity of their profitability.