I printed out a list of questions/problems I have with the WTS, and keep it handy.
Last time I had a JW (I finally started getting visits again after 6 years of none), I told her that I've got lots of questions and red flags, but no JW has ever been able to help me out or come back to answer them. She gave me a surprised look. I told her I had a list of questions ready, and if she'd be willing to exchange I'd take her WT. She agreed.
Never saw her again. But it's a simple idea--you don't have to prolong contact, and you can have the information really handy. Maybe a good idea for some who don't want to interact much or, in my case, who don't have the time available (yet don't want to waste an opportunity).
bebu