I've been doing some testing on 30-pin cables for iPad 4S and earlier and found that most of the really cheap cables won't allow for full current for fast charging.
It appears to be due to the fine gauge of wire used to save money, which restricts the voltage or current. Initially became suspicious when I noticed that my 10ft cable charged my phone very slowly, a 6ft rather fast, and one shorter/fatter/more expensive cable charged very very fast. I wanted to understand why (was it the charger, or the cable) and started running tests with a multimeter.
I found that good cables will allow for a full 1.0 Amp which is the maximum an iPhone 4S will draw (regardless of the charger) during rapid charging. When using cheap cables I see only 0.7A current draw. With some really long cables 10ft I see even less at about .4-.5 Amps.
FYI: iPhone will rapid charge when the batter is under 80%, then it will slow charge at 80%-100% in order to preserve the battery.
So be careful of really long cables. You might be better off getting an extension cord and using a shorter cable. Not all long cables are necessarily bad, just be aware that the really cheap ones (under $5) tend to be in my experience so far.
If you stick with Apple cables then you should be all clear. The other words to search for are "Apple certified" when doing Amazon or Google searches. I think I'm going to stick with that from now on. Also most major brands you buy in stores should be fine. Just avoid the super cheap ones on Amazon and ebay. One thing to look for is cable thickness. If it's really thin, then don' buy it. If it's thicker, then it should be fine.
I just ordered some form Monoprice.com that I'm going to test out this weekend. They have some different lengths, they are all certified, and reasonably priced. If I verify they hold up to the tests, then I'm probably going to just stick with those going forward (I have had good luck with Monoprice products.)
Now I know you're asking about lightning cables which is a little different. But I believe the same principal holds true. I don't have an iPhone 5 (waiting for the 5S).
Also, just because they don't allow for full current draw isn't necessarily a bad thing. If you just want a long cable for using in a bedroom for charging overnight, then slower charging is not an issue. In fact it could be a good thing since it will force the phone to charge slower, cooler, and therefore better on the battery. Maybe stick with one really good shorter cable for when you need fast juice.
I bought a 10 foot lightning cable from stack social it was around 8 bucks I think. It works with iOS 7 but still get that little message. Don't think the cable will be disabled and if so a jailbreak will come out enabling all 3rd party cables again anyways. But yea in hindsight I should have bought a USB extension cable instead.