I have an x270, which isn't exactly what you're asking about, but IMO...
its super convinient and I love having it. it's nice not fiddling with cables, and the bonus ports are nice for when you need them. I think my only "complaint" is that lining it up for docking takes some practice, but you get the hang of it over time, it's not that bad. Also be careful if you want to get it for multi monitor stuff- there's a science behind which combinations will work at the same time, apparently.