They charge $150/hour for it but it's peace of mind knowing that if I ever need it, it's there.  

Remember to allow tenants the ability to enjoy their home, in peace, and entertain friends from time to time.It sounds as though you are a bit gun shy based on your experience with previous tenants moving in additional tenants.

Last but not least the cost of borrowing is low like 0%.Tax is also another consideration.Compounding interest is also another consideration.Average rate of return versus real rate of return is another consideration.The cost of borrowing to minimize your opportunity cost is also another consideration.And of course, peace of mind is the biggest consideration of all.I have played the game of real estate investing and cash value life insurance for the past 7 years. 

Which one of these scenarios would give you more peace if mind?

If I can find a good enough deal and get some peace of mind about finding a tenant I think I could work up the courage to take the plunge.

Peace!

Was quite and peaceful.

We have tenants who actually wanted to purchase the property but came to late and decided not to purchase as she just approached retirement, can’t find in the rest of town what she found at our duplex, and wants to stay put in a peaceful neighborhood.