With three million snapped up in its first four days on sale, the new iPad is the hottest gadget around.
For some customers, however, that's been a big problem.
An influential US consumer watchdog is investigating online reports that Apple's tablet computer generates too much heat.
One disgruntled customer said they were returning theirs after it reached temperatures of 47c following only ten minutes of use.
Dutch technology website Tweakers said the new iPad, which went on sale last Friday, was 5c hotter than its predecessor when running.