The Dell Latitude E5520 is a laptop designed for business use that boasts a robust performance and a host of features that set it apart from other mainstream notebooks. Aimed at professionals who demand mobility, reliability, and power, the Latitude E5520 does not fail to deliver.

One of the most significant attributes of Dell Latitude E5520 is its high-speed performance. Powered by an Intel Core i5-2520M processor with 4GB DDR3 RAM, this laptop inherently assures seamless multi-tasking. On testing it with various demanding business applications, it astoundingly held its ground without any noticeable hitches.
The build quality of Dell Latitude E5520 is noteworthy. Its robust and durable design, thanks to the Tri-Metal casing, provides ample resistance to wear and tear – a feature particularly useful for those constantly on-the-go.

In terms of display, the device comes with a 15.6-inch LED anti-glare screen possessing a resolution of 1366 x 768 pixels. The screen is bright with sharp image qualities that would serve well for office presentations and viewing business-related documents and media content.

Dell has equipped the Latitude E5520 with a variety of connectivity options, including Bluetooth 3.0, Wi-Fi, Gigabit Ethernet, HDMI port, VGA port, headphone jack, microphone jack and USB ports. It also includes a DVD writer that adds more value to the whole package.

Regarding storage capacity, the laptop provides you with enough room with its 320GB hard drive storage type HDD with a speed of 7200rpm.

The Latitude E5520 offers impressive battery life too – a crucial factor for business people often disconnected from power sources. The laptop’s six-cell battery lasts about 8 hours under average use on full charge – an impressive feat for power users.

However, there are some areas for improvement in this model as well. The aesthetics, though solid and functional, are not particularly appealing if compared against sleeker options available in the market today. Also, the system might feel somewhat heavy at around 2.5 kgs to some people who prioritize portability above everything else.

Conclusively weighing in on its strengths and weaknesses, we can say that Dell Latitude E5520 has shown to be an excellent choice for those looking for reliability in everyday business tasks but might not be as appealing for those seeking ultra-slim aesthetics or lightweight mobility.

In conclusion: Dell’s Latitude E5520 offers great performance and long-lasting battery life. It falls short on style but shines where it matters most – in delivering a solid user experience suited well to business professionals. Invest in this device if you place higher emphasis on smooth functioning over fancier exterior appeal.