I've used a dell latitude 5420 and I think it's got that quality. Always works. It has a few quirks (rarely hangs on suspend or similar) but no major problems.
The 5400s and 5410s had tons of issues with power, heat, and general acpi funkiness but the 5420s and 5430s have been rock solid for my org. I really want an AMD 14" Latitude but I don't think that's happening any time soon.