Invest the money and then buy the 334 instead. I have the 333 and have considered the upgrade myself. I talked to the guys at Madrigal about the upgrade about a year ago. The reason it's a 331.5 and not 334 after the upgrade is because it will not be up to par with a 334. It will only bring you one step closer. I didn't think I could justify the cost at this point for myself.
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