My primary laptop is an HP 8510w. It’s about thirty months old..and I don’t yet hate it…which is a sure sign that it was truly a nice machine when I first got it. This was my second HP laptop after a long history of using Dell models. Given any choice at all I won’t ever go back to Dell.
Under normal circumstances my employer would agree to replace the machine after three years (36 months) use. Some companies, like Exxon-Mobile where my brother-in-law works, would push that out to 48 months. When a laptop gets to be four years old it’s usually very slow & compared to current technology. It becomes a source of frustration. At least for my activities, which are graphics heavy, there’s a very real argument for a 36 month upgrade cycle.