On the whole, I'm really quite happy with the machine. I've got two small issues right now. The touchpad does occasionally lose touch sensitivity (hard-pressing the buttons still works, but movement and tap both do nothing). I haven't had time to look further into this yet and have had to restart to get my pointer back, which is a little annoying.

As reported for the previous model (e.g. http://en.community.dell.com/techcenter/os-applications/f/4613/t/19982360), the touchscreen still stops working on a lid-close suspend event, and the same workaround as discussed in the linked thread reenables it (closing the lid and quickly reopening to then use the power button to resume). I'm not using the touchscreen a lot and there is a workaround, so it's not as much of a problem as the touchpad, but it's certainly not ideal.