Converted garage, thoughts?

[Paul Zofsak]

I have a great opportunity to pick up a nice single family home 3/2/2; the numbers are great but the only thing i am unsure about is that they have converted the garage into an additional living room.  The remodel looks to have been well done but I have never dealt with this and would like to know:

How will this affect the appraisal, market desirability, and would it be worth it to convert it back?  I plan on rehabbing and leasing the property.