All this being said, what are some advantages, disadvantages, and insights you have with duplexes? 

I would recommend raising it incrementally throughout the years in order to avoid the shock to the tenants system of raising it in one big chunk.If you choose to not raise your rents throughout the years, it will also put you at a serious disadvantage when you are looking to sell because now you have a long term tenant paying below market rent.  

3) Are there advantages or disadvantages to pairing the 401K to a trust vs. a LLC for asset protection?

- What are the advantages and disadvantages?

On the other hand, some disadvantages of HOAs include the potential for restrictive rules and regulations.

If you're getting prices any time after a storm, you're at a big disadvantage....

MLS is one tool that has advantages and disadvantages.

There are many out there, each with advantages and disadvantages.  

There are numerous platforms available, each with its advantages and disadvantages.

But coming in cold has its advantages and disadvantages.