When I first started collecting I used it to call out of my area dealers for elusive retired pieces. Now I use it whenever I am going on a trip. I'll print up a list for the state I am visiting and take it with me. I do occasionally check my home state to see if there are any new dealers listed.
Only problems I have encountered were some out of business dealers that were stil listed (and once I stumbled upon a dealer not listed!).
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Ken T