Actually, I should clarify that I snagged my DELL XPS12 for 40% off as it was returned new at a local computer superstore, but with a WIN 8 boot issue. Just the type of situation I look for, as it was an easy Windows fix. No OS restore or repair needed. Didn't come with a restore DVD anyway, as it only has an SSD drive. Was not a DELL hardware issue, and has worked flawlessly since. Plus, came with a 15 month warranty when I registered it with DELL.
Also found an immaculate $500+ 24" HP wide-gamut, higher than full HD native rez PC monitor for $59., which was returned by the purchaser as would not display under WIN 7. Another five minute fix, and stunningly beautiful running with WIN 7 Pro with no issues at all.
Don't know about customer support for either DELL or HP as have never contacted either of them. But did have the best service and response for a defective laptop under warranty with IBM, a US company, before the brand was sold to China based holding company Lenovo.