Sorry this isn't a very technical answer, but I had a Samsung laptop 3-4 years ago. I can't remember the model unfortunately but it was a ?1000 laptop, not a cheap one and I was very disappointed with it. Build quality was very poor. In fact I nearly sent it back within the initial returns period and on hindsight wish I had done now.
I'm also currently looking at the XPS 15 and will be looking through some reviews when I get the chance. The XPS 13 seems to be vey well received. I had the original XPS 27 desktop a few years ago and it was excellent, and the Dell Venue 8 Pro Windows tablet which isn't the prettiest or slimmest tablet you will find but is built like a tank. I've always found Dell support to be excellent too, contrary to what you may read elsewhere.
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