I'm a very heavy user, since the 1990s, and have had an extremely reliable experience with Lenovo. I replaced a power supply once (cheap) and recently paid for an overhaul - but this is a unit I have used many hours every day for the past four years. I've also found the Lenovo parts and service access to be superb (I'm in Indonesia).
It's amusing because Lenovo purchased the ThinkPad business from IBM, and their laptops were real p.o.s. When I worked for the CEO at PT Semen Cibinong we bought three IBM laptops: one for him, one for his son ($7000!) and one for me to use. All had problems - the so-called "butterfly keyboard" on the unit I had was spongy and flimsy. The laptops were clear evidence of Big Blue's contempt for PCs. When they sold off the business to the Chinese I expected the brand would continue to sell crap. Happy to say I was dead wrong about that.