Is anyone using a second display for a laptop? If you are, what are the make and model if you know, and how do you like it?

I need a somewhat larger and better laptop display, and I am curious about the experiences of others with these - thanks!

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I need a small, high res display that is USB and portable.
Is anyone using a second display for a laptop? If you are, what are the make and model if you know, and how do you like it?
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