The depth does vary somewhat, though the biggest variation deals with the "rough in depth".

Ryan,Sorry I forgot to subscribe to the replies.I compared TLO and accurint initially, I opted for TLO because they offer trial runs and pay-as-you go, whereas accurint does bulk pricing with no trial run.TLO hasn't gotten us much progress in skip tracing, not much better than those low end sites like spokeo/ussearch.I will be testing accurint in the next month.

Seems like a win-win to me, but was curious as to whether anyone has tried this or any type of mutually beneficial variation?  

In any event it takes much work and trial and error in life to find the right recipe that works best for you. 

A lot of 'trial and error' and nasty calls from people who want off your mail lists. 

You could definitely figure it out if you spent enough hours on BP, listening to podcasts, and going by trial and error.

Some of this knowledge comes from other REI but even more is from trial and error. 

My wife isn't totally on board, so its a trial run for us. 

Having a rather small budget to work with on my first mailing campaign, I decided to spend a little more time on it and came up with a variation of Mail2flip's  mailing which places a photo of the property on the mailing to increase opening rate.

I've been told that same thing (different variations of course) by several people.