I've just noticed that Redfin's value estimating tool, wherein you could select your own comps for accuracy, etc, appears to be a thing of the past.

In other words, is the effort involved worth the added accuracy?

This had to go through the buyers agent, through the lender and down to the appraisal company, who would then review the appraisal and its accuracy.

Its all about efficiency and accuracy and with what he will be giving out will assure you that you will be confident in your rehab numbers.  

I've found that I get 1 out of 25 numbers are incorrect, which is roughly 90% accuracy rate on a 1000-lead list.

Most are software services that compile reports automatically.The advantage to having a screener look at your report is to verify accuracy and remove data that should not be considered when screening tenants.I've only seen a few services that offer that support because it's much easier and cost effective to just have an automated service.

my favorite has always been listsource.com  fairly priced compared to the rest of the market (I have tried a ton) and pretty darn good accuracy/deliverability rate.

The accuracy of online numbers is hit or miss though but it's a numbers game. 

I think you will find your next investment property pursuit will have a much more favorable interest rate and you will be more aware of the financing in general and be able to predict your bottom line after closing the finance with a bit more accuracy! 

when you begin keep it simple and learn to make your numbers count with its accuracy.