I have lead connections on my list to try soon from you recommending them previously.
I have the same concerns as you do about benders who keep getting few replies when they are mailing very similar lead pieces. They either use crummy lists or don't mail the right number.
To sum Chris at Lead Connections up I'd say knowledgeable, honest and prompt. At the end of the day you really just want to know that the amount of mail dropped was actually dropped to who you wanted it dropped to. I'm 100% convinced that is what they do every single time. Are they a couple of bucks more, probably, my take is that you get what you pay for in this instance. It's also not nice to not have to worry and wonder if your mail actually dropped or not.