I was wondering if anyone had experience with them and would be willing to share (*ahem) some strategies.I'm also unclear on what needs to happen after a purchase to clean up the title and ensure there are not other liens... 

Do you have any quant data to provide insights, like you provide on local housing markets?

Using any systems to manage the call influx, data tracking, etc...?

If I did not mention the property taxes, how do I ensure the buyer pays 10.5 months worth of taxes at closing?

The other big risk with any investment right now in the AV is that the market is fairly high right now and historically this area gets absolutely hammered when a recession comes ... it always comes back, so if you are a long term investor it won't matter as much, but something to be aware of and carefully structure to ensure that you can hold through a downturn to make it to the long term.

@Kenyon MooreI use the data from the tax assessor to do direct mail

These typically fall between 6-9 depending on who is evaluating and which parts of the country they derived their data from.  

The MLS is VERY valuable for housing data and what is selling in a particular area, sales is the lifeblood of any Real Estate Investors business also it's a very good lead source and you can figure out what the market is doing as well.

She was easy to work with, has an experienced crew that do good work, and was able to make the job fit my budget while ensuring that no corners were cut.

But, as with everything don't lay all your eggs in 1 basket. try some other forms of advertisement, like Facebook, twitter, Instagram, craigslist, for example I don't have a lot of FB followers on my business page but, it get's me a lot of clicks to my website with a $5.00 boost campaign where I can collect data from buyers and sellers.