The NSeries line of devices has been always criticized by their plastic-like and cheap build quality, while the ESeries range has enjoyed of higher quality materials and an overall excellent build quality.

ESeries devices often include some metal component on their exterior, NSeries usually don't and the reason for that is still unknown. The metal components is not the only bad point, the adjustment of the device and the build quality is more solid on the ESeries range than on the NSeries range.  I had a E90 few months ago, even with that complex form factor, the device is solid and there is no such thing as creaky panels, wobbly parts, and so on.

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