I bought two: one for me and one for my wife.

The most interesting hardware feature of the Nexus 5 is the amazing list of frequency bands and standards that it supports.

Really, what's not to like about that? I suppose I could find odd things to complain about ("what, only 9 different LTE bands?"), but really, this is very impressive.

One thing I'm wondering about KitKat is that they've apparently gotten rid of the grey/blue transition on the signal strength meters, which previously indicated that your phone was successfully connected to Google's backend servers. I don't know if they've found some other way to indicate this or not.