Aviate has a problem: it's not Google Now
Aviate is the latest Android homescreen users want; for the past day or so thousands have been asking for an invite. It's a slick homescreen replacement that does away with a conventional app drawer for a 'dynamic' homescreen; Aviate's parent company's founders, who used to work for Google, think they can do Google Now, Google's flagship prediction engine, better.
For the large part, Aviate is good. It looks nice (the dark theme is fantastic), it categorises apps so users can reach them easily and quickly, and allows you to have different pre-configured workspaces depending on what you're doing. While not as customisable as other homescreen replacements such as Nova or Action Launcher, it arguably looks better without needing to customise it.
However, Aviate has a problem, and it's not a simple one to solve. However hard it tries, Aviate can not 'replace' Google Now. Google Now, in theory, knows all about you: knows what flights you've booked and when they take off, knows your upcoming events or appointments, and where you live, work, or go to school. Google know this because they scan your email looking for keywords, and use your search terms to predict what you need or want. However hard it tries, Aviate cannot do this (yet).
Eventually, Google will put Google Now on the homescreen: the Android version already has a widget, and the company's upcoming Google Experience launcher is the first step to a full Google Now homescreen. Until then, Aviate is a worthy candidate for your homescreen, but for me, it will never replace Google Now, because fundamentally, they don't do the same thing.
I like Aviate. But it's not Google Now. And that's a good thing, in many ways - because only Google can do Google Now.