PROs and CONs of Turn key properties

[Jeffrey A.]

Hello, I am still a very new investor.  I am in the learn as much as I can stage right now which means I am reading books, listening to podcasts, hanging out in the biggerpockets forums, etc.  I am a full time research scientist in San Diego and want to do real estate investing as a supplement to my income.  I am most interested in the Buy and Hold rentals and came across a few turn key companies.  I was wondering what some of the PROS and CONS of turn key rental properties are.  Thank you.