I have been using Quicken Premier 2017 for about a month now and it has been smooth sailing. I don't like the skinny fonts, but by now it is clear that the register fonts can be changed to whatever suits the user. The other fonts in Quicken, not so much.
There are a few new features but I don't use them.
For the past several years, Quicken has given me an annoyance that has finally disappeared. When I did one step update, it would very frequently fail with one of several error codes. Some, but not all of my financial institutions would return an error code. If I redid one step update, the errors would usually vanish. The worst aspect was that about half of the time, the error message was "Quicken has cancelled this update at your request." I could just scream.
I HOPE that this bug is gone for good! A related bug is still present. Sometimes, one step update will refuse to even start, and an error box tells me that I am not connected to the internet. The work-around for this has and continues to be, launch Internet Explorer and navigate to a web site. Any web site. Then execute one step update again.
I can't be certain, but the one step updates "feel" a bit faster than before.
I am a huge fan of Quicken so the one bug fix more than justifies the cost of upgrading. Please don't interpret this statement as a piece of advice; I realize that this is not sensible.