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I totally understand this feeling, my previous Laptop was at least 10 years old when I switched to my current one. (I don't plan to have this one for long, though.)

yes you can understand me perfectly. 10 years is almost a life limit for a pc

I like the way the screens are superimposed!

yes with 2 monitor I prefer this configuration instead of the horizontal configuration

2/3 I started looking at pre-assembled computers and compared the cost with a computer I could assemble myself.

Assembling a computer is one way to save a money