Hey David! Doug Smith here. I founded/run MyHouseDeals.com and just came across your posting.
We started offering a constantly-updated list of private lenders to Premium Elite members in early May. That's just a month ago, so most members won't have a significant amount of experience in dealing with them yet. But if someone in the BiggerPockets community has actively pursued them, it would be great if they chimed in.
(Although I can tell you that David Sims in Dallas, TX used a pre-release version of the same private money list to raise over $1 million from 3 lenders back in February.)
All of these lenders are members of MyHouseDeals.com, and they filled out a form saying that they're looking to lend private money. Then they submitted their "amount to lend," "interest rate," etc.
Each lender is different, but you can use the terms they submitted as a starting point. So when you call them, you can say something like, "I see that you were interested in lending up to $100,000 at 10%. Is that still the case? Ok, great. I have a deal that might meet your criteria..." When you have a deal ready, you'll probably want to call those with the lowest interest rate requirements first.
Hope that helps!
Doug