Zillow is now owned by Trulia and hopefully some time in the future changes will be made to improve accuracy.

Note: I am providing this advice solely as a matter of opinion and assume no  liability for the accuracy of this advice nor any omissions or errors that it may contain. 

My commercial lender is very impressed with the rental analyzer pdf's i send him.Regarding accuracy, math is math.  

As a result, I can tell you with a very high degree of accuracy what a properties comps are, before I do an analysis on it. 

Lenders are required to give the APR within in one tenth of one percent accuracy, using 12 months won't do that due to rounding. :)

When doing a flip, accuracy is key, as carrying costs will eat our lunch - so we had to ask for the reduction to stay within our anticipated DOM. 

Please also verify the accuracy of this information at the time you are considering these options as guidelines change.price Decorating allowancesRepair allowancesMoving costsNote—a dollar for dollar sales price reduction is also required for - Excess rent credit and gift funds not meeting FHA requirements Contributions exceeding the actual cost of prepaid expenses, discount points and other financing concessions Credit Requirements Required is 600.

Just figured how to access prop info by address online from the county assessors office.

Can anyone tell me if the FMV listed here leans more towards Zillow estimates or is it closer to the figure a realtor might gi...

What I would be looking for in the analysis is not 100% accuracy, but that they generally are covering the expect cost categories and the estimates are reasonable.  

The more data you can provide in full and accuracy the greater chance you will have of getting a high good execution on the asset.