Ive gone back to the N7 FHD, got one for $160 like new on Amazon and an official Google Folio for $10. I have had 4... yes FOUR Nexus 9`s so people cannot say i didnt give it a fair go, even though they do on that side of the forum" and it was my 4th N9 that was actually decent with good build quality but thats not enough. I dont care what anyone with a N9 says, if they say different then they are straight up lying trying to protect their purchase but the N9 lags, its can take seconds to switch apps. the 7 does not seem to do this, it can literally take a full 4 - 5 seconds sometimes to return to the home screen. I dont know if its the K1 or poor optimization so far but for a $500 tablet its really poor.
Back to my trusty old fave being the N7 FHD.... and if the 7 is to small for you then i highly recommend the LG G PAD 8.3 Google Play Edition over the Nexus 9... though they are getting hard to find now