For tools that I need to depend on often, or need to have a high degree of accuracy with, I will go ahead and buy the more expensive options.  

But to do both I think is a duplication of effort and wont increase speed or accuracy.

I would argue that the accuracy of the values on renotmeter.com vary dramatically, however it's still a valuable tool to have in your arsenal.

Census Bureau, Bureau of Labor Statistics, Consumer Price Index, Federal Housing Finance Agency, Moody’s Economy.com, The Brookings Institution, National Association of Realtors, and National Association of Home Builders.The numbers tend to be a little conservative, but the accuracy over the last several years has been over 80%.

I haven't found a lot of accuracy with online value sites.

Recently, like this week, Zillow announced a contest with a $1.0 Million Dollar 1st prize to any group of programmers who can help them improve the accuracy of their Zestimates.  

How can I improve my accuracy at assessing rehab costs?

We are in central FL, so commenting directly on Miami is not something I can do with any level of accuracy. 

Incomplete items can be challenged through credit repair and are likely to result in successful disputes.Similarly, many bankruptcies and some foreclosures are also eligible for deletion subsequent to dispute on the basis of accuracy, completeness, etc.

LOL> had to hire staff to clean up his docs and outside attorneys docs.but like all things you get what you pay for and when these guys are only charging 300 to 500k for escrow services you get about that much of work.if I go to my 450 an hour attorney here in PDX everything is perfect but a simple closing would end up being 3k.. this is why title and escrow on the West coast that are owned by the TITLE insurer is so FAR superior to anything we can do in attorney driven states at least when it comes to efficiency cost and accuracy of documents not to mention communications..