When the logic board in my current model MBP failed, I had to leave it with them for 6 days. When the graphics card had an issue in my previous MBP died, 4 days.
With a Dell, you can at least choose to pay for NBD repair. UPS guy shows up, it's repaired and back in your hands within 48 hours. And that's if they don't have a service contractor in your area that will come to your home/office.
Yes, you pay for it. But at least it's an option.
That said, moving my data and preferences and everything to the replacement box (and having to delete them afterwards, so nobody gets into them) is too much work. I'd rather have a spare laptop/desktop myself ready to go when the need arises.
As professional programmers, spending like $2-4K for 2 laptops every 4 years or so isn't that much to ask (which we can also reduce from taxes AND sell afterwards).
Heck, if we owned a taxi, we'd spend far more on its maintenance and operating expenses for the same period, and make far less.