I have the 2014 T440s and it's the best laptop I've ever used, though I guess that's not a particularly large sample size. I definitely think the 2015 T450s sho

I have the 2014 T440s and it's the best laptop I've ever used, though I guess that's not a particularly large sample size. I definitely think the 2015 T450s should be much better because they brought back the buttons but the clickpad is not really that hard to get used to. I think this year's Thinkpads should be really awesome, and if I could justify it I'd easily get a 2015 X1C now that they fixed the keyboard and trackpad. It does have a wifi issue, it seems to me that the Intel 7260 wifi chip has serious issues across multiple laptops from what I've read online. But I found that for my home network switching to 5ghz fixed all my issues so it might just be an interference thing.