Fwiw - I've been buying used and refurbished ThinkPads for a decade. Maybe because they're typically used for business but they've aLl been in immaculate shape (no gritty keyboards) and have them lasted for many many years. None of them actually failed me, I just eventually moved on. I still use a t420 and two t420s ThinkPads which I got used and are now coming to 11 years old. I just got a t440 which is probably 8-9 years old.