I had four of these laptops gone through my hands in the last 7 months ( I resell them). I have always been a fanboy of Lenovo Thinkpads X and T series but wanted to give this little beauty a praise it have deserved.
I am currently keeping one with i3-6100U cpu, 256gb ram, basic tn panel and 8gb ram. And for a reason: battery performance is stellar- I manage to go a full day on one single charge. It have survived a very heavy impact with metal railing on the bus with only lcd cover hinge being dented and here is food for thought: yesterday I have accidentally poured the whole massive mug of boiling hot fruit tea all over it- it was drenched inside out as tea entered the system from top and bottom every opening laptop has. I was very confident laptop died as I lifted and tilted it on side (against every common understanding this would guaranteed a sure death of any laptop) spreading hot liquid all over every single powered component and system...
Conclusion: it took me 30 minutes to fully disassemble the laptop, not memorising what screw came from where, not using any static protection and using toilet paper roll to clean and wipe the liquid (from what I though already dud mainboard) and brushing visible oxygenation amalgam (whitish colour) of short-circuited areas, clearly visible to my eye using an old toothbrush, leaving it to dry for another two hours only and assembling it back completely intuitively... the thing have failed to die. Unbelievable. I have run every diagnostics program third party and Dell's own including stress tests and close monitoring- touch wood no problems whatsoever. Every previous Lenovo machine I had have died on me in exact circumstances. May be it is a pure luck but it really worth mentioning.
In my opinion Dell have raised their quality standards to a completely new level. My though was to sell this machine at a first opportunity but now I am going to keep it, fr sake of curiosity. I have a strong feeling it won't let me down.