Whats it like to invest in C or D class properties?

[Chris Gawlik]

I think with the economy the way its headed there is going to be a need for more affordable housing.  

Wanted to hear from those of you who are successful in the C and D class property niche. How many properties do you have? How do you handle repairs, compared with other B+ and A type real estate classes? How and why did you choose this niche? Are you still currently buying this type of asset? What state and local areas do you buy in ( please be as specific as you can )? What are the advantages and disadvantages of working with this type of asset class?