There is also a great video explaining how to use it with pretty darn good accuracy.

All of your questions were very open ended and in my mind impossible to answer with any really accuracy.

Anyone have access to a service of some sort with a very high level of accuracy in regards to the recency and quality of the information?

Employee bonuses are based on the accuracy of their home bids and rental estimates.After submitting a bid, Starwood Waypoint employees visit the home with iPads and take it through a 45-minute inspection, marking what renovations need to be made.

I was just thinking about this as I was reviewing a 56 page contract for accuracy and missing initials.  

Value = NOI/Cap RateNo clue on the accuracy of your cap rates, but assuming they are correct:Building 1 = $319KBuilding 2 = $322KBuilding For Sale 1 = $500KBuilding For Sale 2 = $656KSo seems you are pretty close with your values except for Building 1.The 2% Rule is simply GSI/Market Vale (or purchase price, or ARV, or whatever you want to use).

Has anyone had any experience with the accuracy of blockshopper

I'm in the middle of purchasing what will be my first investment property and would love some feedback on both the accuracy of my analysis and whether this property was a good selection.

In your opinion, what level accuracy do you expect when it comes to estimating repairs? 

So you can do one of three things:(1) prepare a mock 1040 as you normally would as this will give you a high level of accuracy if prepared correctly;(2) review your previous returns and determine your effective tax rate, then apply that rate to this years earnings; (3) have a CPA do it.I get this request all the time so I've built a template for myself that allows me to quickly estimate a client's tax liability.