I’ve just received my Nova and here are my initial impressions so far (I’ve had two Kobo readers and this is my first Android reader):
Boot time: I timed it at 35s from pressing the power button to the home screen.
Battery Life: similar to my KA1, considering I’ve been playing with the features (wifi, apps, front lights, etc. ) I expect it to last longer when I focus more on just reading. I also turned-off the battery percentage display on the status bar because I find checking the number as it decrements too distracting.
NeoReader: I wish it supported Kepubs (most of my books are in that format now). I will surely side load my fav fonts to it. I only found one Eng-Eng dictionary (Longman) and I might look for another one. TTS was a cool feature though at first no sound came out of my BT headphones and I had to tap the volume once for audio to come out.
Google Play: everything was smooth with setup and installing apps. Kindle app performance was terribly slow. KOReader was so far good. I couldn’t find a way to open kepubs in Kobo app.
Calibre Sync: Nova got detected by Calibre and transferring 400+ books was lightning fast.
Overall I’m happy with it but there’s still some tweaking to do here and there.