I bought the iOS app awhile ago, so I was on the grandfathered Plus plan. I wanted to sync with the Mac app, so I went ahead and bought the 50% discounted premium plan. I like it, but I thought the Mac app would have more formatting options than the iPhone. It doesn't. It's basically a larger version of the iOS app.
It's way too expensive if you're not on the plus plan. It's expensive even with the plus plan. You can't use iCloud for storage either, which I don't understand. Having cloud storage can be expensive for companies, so they increase the prices, but they removed iCloud sync, so now everyone uses their cloud storage.
My favorite feature in Day One 2.0 is the daily prompt. Instead of letting my journal become the 'Rant of the day' entry, Day One attempts to help me create a rich and personal record with their creative prompts.