It's been excellent (used it twice: fixed a broken keycap, and a spilled drink), and gives me a ton of peace of mind.
I am very satisfied with that thinkpad. Excellent linux support, good performance, quiet under sustained load, best laptop keyboard I’ve ever used, and extremely durable.
My Dell Latitude had included "next business day" 3 years warranty. I used it twice (to get motherboard and display replaced) and they sent technician next working day. There were a bit more failures then I would expect, but warranty was great and I happily bought 2 more years (5 years total) for equivalent of about 200 USD plus tax.
I've also heard from friends that E7*70 had a bit higher failure rate than usual. It still seems (subjectively) to be much lower than Apple's issue with keyboard. Most importantly, they fixed it almost immediately.
Today, I don't expect things to not break. I'm still annoyed when they do, but more important is what happens after failure, how long (and how much effort) does it take to get things working again.