I've never had a problem personally, but I can remember a call several years back when a house caught on fire. The responding units who were enroute to the 'address' provided by the CAD could see the smoke from across the valley (a number of miles, maybe 10 or so). The house burned to the ground. I never really new how it was settled. That happened just before I came on. In another case in another county, a caller had a medical issue where he couldn't articulate his location clearly. It was something about him saying ###50 and the dispatcher entering ###15 or vice versa (fifty vs fifteen). That one did not end well.
Here's the deal, and I've probably mentioned this before: it's 2016 in the United States of America and when someone calls 9-1-1, they expect the person answering the phone to know where they are. Personally, I don't think that's asking too much, but if things do go wrong, and people are hurt, lives lost, or property destroyed, you can bet the lawyers will be looking for the deepest pockets they can find. And even if there is no negligence proven, it will still cost a ton of money, and cause a lot of grief.
Having a paper trail (aka meta data) for your data is a pretty good idea. For example, I use the address data provided by the County and the addresses are assigned to a parcel which of course is recorded. If the person calling provides an address that he or she "has been using for years" and it doesn't resolve, and I have the recorded address in my database, you better believe that's an Ace I'm going to play before things end up in court, and hopefully shows due diligence on my part. Just the other day a business owner complained that "9-1-1 can never find my address". Guess what?! The city changed the name of the street quite some time ago, its recorded as such and the correct street name is on his business license. I don't know, maybe he didn't get the memo, but I'm golden. Same goes for common names. I'll get the request- "And I like to spell it like this, but he likes to spell like that and she spells it entirely different...." Not gonna happen; I use what's on the sign out front.
I subscribe to a couple universal philosophies: First and foremost; Happy wife, happy life. K.I.S.S. (keep it simple stupid) and PTA (Protect thine @$$)
That should just about do it....