Samsung has shipped five million units of its Galaxy Note "smart notepad", surpassing most expectations, according to analysts.

When the Galaxy Note was launched last year it was seen by many as a bit of an ugly duckling, sitting uncomfortably between the smallest tablets and the biggest smartphones with its 5-inch screen. But Samsung has turned it into a success with aggressive marketing, distribution and good product design.

"Compared to what people thought when it was released, Samsung has delivered above expectations," said Neil Mawston, executive director at market research company Strategy Analytics.

CCS Insight's Geoff Blaber agreed. "For a product which many initially thought sat in a no-man's land between smartphones and tablets it has done phenomenally well," he said.

There is an audience that wants tablet functionality, but in their pocket, according to Malik Saadi, principal analyst at Informa Telecoms & Media.

Digital S Pen

The Galaxy Note was launched in September. It has a 5.3in Super AMOLED display with a 1280-by-800 pixel resolution, and can be used as a smartphone or a "smart notepad," according to Samsung. The digital S Pen lets users write and draw directly on the screen.

"It is quite an attractive looking product. It is sleek and shiny, and that seems to resonate with consumers," said Mawston.

The Galaxy Note has also benefitted from a change in usage patterns among consumers. They are making fewer calls, and spending more time on the web, according to Roberta Cozza, principal analyst with Gartner.

"The 5in screen is really cool if you don't mind holding it to your ear when making a call, or using a headset," said Cozza.

Publicity and marketing

Samsung's marketing of the Note is something that analysts also highlight as one of the reasons why it has managed to ship five million units.

Samsung's latest publicity stunt shows an elephant using the Note, a juxtaposition that is more flattering to the device when it is held up to so large an ear.

"Samsung has been promoting the Note hard, and the company has pretty deep pockets these days," said Mawston.

The company has become more canny with its marketing as a whole, not just the Note, according to Blaber, who thinks that the Note has been helped by the success of Samsung's Galaxy S II.

One of the reasons why many thought the Note would struggle was because the similarly sized Dell Streak had failed.

Ice Cream Sandwich

"The Dell Streak had 5in screen when 3in screens dominated, that leap was too far for consumers. But now consumers in developed markets are much more familiar with 4in to 4.5in screens, so the jump to 5in is no longer such a chasm," said Mawston.

Also, the Streak wasn't helped by Dell's lack of brand awareness in the mobile space and a bad user experience, according to Mawston. Android simply wasn't ready to be used on a device with a bigger screen, Saadi said.

But just because Samsung has blazed the trail doesn't mean similar products, including LG Electronics' Optimus Vu, will become a success.

"I think that competitors will struggle to reach the kind of volumes Samsung has witnessed," said Blaber.

Even if Samsung has managed to turn the Galaxy Note into a success, the company can't rest on its laurels.

The Note was supposed to get Android 4.0, also known as Ice Cream Sandwich, during the first three months of 2012, but the upgrade has slipped to the second quarter. Also, the digital pen needs to be improved, according to Cozza. There are some glitches, and it isn't as responsive as it could be, she said.