Let me start with the bottom line,
If you value your time and have a busy mailbox, you should definitely get Snoooz.
I've been waiting for a Motion alternative in this space and I'm was happy to see Snoooz coming to AppSumo.

To set clear expectations - There is a learning cure and even more importantly a training curve to Snoooz before you start seeing results, and this is the only reason why I'm giving it 4/5 stars because I *feel* that the process can be better and smoother.
At the time of writing this review you can definitely expect to have some *extra* overhead in training the app, writing style, deleting extra draft, un-labeling emails and such.
In other words, think about it like training a VA to respond in your name and tone of voice, it doesn't happen in a day.
The potential, capabilities and a new feature to read your last 20 sent emails to identify your writing style are definitely a step in the right direction but it will take time, patience and some effort to get it done right.

The "rules" system, especially how they are prioritized, is a bit confusing. I found myself doing a lot of trial and error.

I want to give a huge compliment and a thumbs up to the support team and especially Chitresh. They have been SUPER responsive, knowledgeable, supportive and VERY helpful overall.

Bottom line,
If you are willing to put some muscle into the process, Snoooz has the potential to become your best inbox companion.