I've been running the T470 which this retro version is basically for about 6 months, I've nothing but good things to say about it, it replaced a Macbook Pro 2011. I did buy a XPS 15 and the new Macbook Pro before landing on this but both went back faulty.
The build quality on the T470 is excellent, best keyboard I've ever had on a laptop, beats the clacky thing on the new Macbooks, and above all it just works. I use it 8-10 hours a day, get 4-5 hours battery out of it running Visual Studio with Resharper, SQL Server and IIS on it.
I am converted, which given I was a hardened macbook fanboi prior was a bit of surprise.