It's a bit more money up front, but they last longer, they're more durable and have less issues with water or humidity.

You should also review the contract terms with an experienced attorney to protect yourself against issues from the contractor or their employees.  

The first FHA inspector/appraiser did not make an issue of it.

I have done this with several properties and haven't had an issues using this method. 

She claims she has other children who she has cosigned for out of state without issue.

I feel he’s full of bs.I explained to him that he signed a one year lease and that we’ve never had noise issues/complaints before but that I will ask the other tenant (who has lived in his unit for years with zero complaints from anyone about noise) to keep his TV lowered after a certain hour.There is a clause in my lease that says he will have to pay 3 months rent if he needs to terminate the lease early.

You biggest issue is your dead equity due to the lost opportunity value.

However, I do agree with you that if you do not have a solid income vacancies and unexpected repairs can be a major issue. 

Thank you for pointing out the additional issues to be aware of.

I respond quickly to all maintenance issues.