I finally flew with the latest update yesterday, and it was mixture of "Gee whiz!" and "Oh, crap!"
First, the new split screen is great and, for the most part, useless. It's cool to see the little six-pack instruments working, but does it get us much of any utility? Nah.
The addition of "Track Up", on the other hand, is wonderful! Although one thing I sort of forgot was that "track up" on a moving sectional chart means that the writing will be sideways or upside down a good portion of the time. In other moving maps (like my 496) the writing continually auto-corrects so that it's readable -- something that would be extremely difficult to achieve with a sectional map.
As always, I forgot to pair my Bluetooth GDL-39 with the Nexus 7 before departure. This doesn't impact the moving map (the N7's internal GPS works fine) but there is no traffic without it. As usual, this proved to be a pain in the butt to do in-flight. For whatever reason, the Garmin GDL-39 isn't always easy to pair with the N7. I have many other Bluetooth devices (keyboards, headphones, speakers, etc.) and they all pair effortlessly with the N7, so I believe the problem is on the Garmin side.
Everything worked as normal for nearly an hour -- until it didn't. As has happened on my last several flights, the Garmin app simply stopped working, with an error message popping up apologizing and asking if I wanted to report the failure.
At this point I usually say "no", the app closes, and I reopen it. This time, however, I could not reopen it without it instantly failing/closing. Bad, bad, BAD, in flight.
So...that was the "Oh, crap" moment. Although Garmin has come a very long way with this app, in a very short period, they still have some stability issues to iron out. I am sure I could have futzed with it more and got it working again (it's working fine now, in my living room), but I was entering the pattern and didn't want to mess with it.
I've sent the crash report to Garmin. I hope they work it out in the next update!