ChangeWave's data backed that up: When consumers who said they were unlikely to buy an iPhone 5 were asked to provide a reason, none cited the Maps issue.

The other at-launch change that rattled users was Apple's switch to the smaller "Lightning" charging and data port on the iPhone 5, which upset customers who would need to buy adapters to connect their new smartphones to older docking and sound systems.

Many more consumers reported having problems with that move than Apple Maps: Of those who said they were likely to buy an iPhone 5, 68% said the Lightning port was a problem, with a whopping 31% asserting it was "somewhat of a problem," another 31% saying it was "not much of a problem," and 6% calling it a "very big problem."

Only 26% said it was "no problem at all."

Even so, Carton said the two issues "hardly rank as bumps in the road."