When you say investment I have to guess you are talking about over-funding one of their permanent life insurance policies. Northwestern Mutual Life Insurance has been around for a very long time and has a good reputation and products.
In order to determine if it is a good investment I recommend you request an illustration showing the money you would like to put in with a minimum death benefit. Then do the same with at least another company, talk to your broker for suggestions, and see how the growth looks.
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In order to determine if it is a good investment I recommend you request an illustration showing the money you would like to put in with a minimum death benefit. Then do the same with at least another company, talk to your broker for suggestions, and see how the growth looks.