Is it worth upgrading to Super Huge Donkey in DonkeyMails for 1 month?

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I am in the middle of deciding where to put the money I am currently cashing out from my MBC account. And one of the programs under my options is DonkeyMails. I want to know if one gets back the investment immediately--I mean within the 30 day period of the upgrade--in this program. I am asking especially those who are upgraded members of DonkeyMails for their experience and what they think of this option I have of purchasing the Super Huge Donkey upgrade for only 1 month. Don't be shy in sharing please. Every detail will really help me in making a good decision.