Overall, it's ok. Functional, good looking, but it doesn't meet my expectation actually... Following is not a systematic review, just some points I got from using it for the first time.---Email subject is not a required field, and send & attachment are too close. I sent one email by mistake, coz everything happened too fast...---Inbox and pin function share a similar icon, which I don't like very much, coz it makes me confused.---Bundle feature works fine, I had a look at every category, and found Inbox just recognized the topics and organized correctly.---However, it's not so accurate when I open Social and Low priority. In social, the emails actually are my work emails (I use fb to connect with teammates of my course projects, so I guess Inbox categorizes your emails only according to source of them). And in low priority, are my recent conversations. I doubt if I receive them on Gmail with my laptop, they'll be marked important automatically...---Basically, Inbox gives you a to-do list (which you can't set date/time) and the items are shown together with your pinned emails. Maybe when someone is really addicted to Inbox, and opens it so frequently, he'll use this Reminder to remind him. I'll be happy to use it, only when I can select part of the email content, and send it directly to Reminder.---I'm expecting the nice effect of material design, but this + icon is just an ordinary one. Material design is sophisticated and beautiful, but I'm afraid it's making design more difficult, even for professional designers, and it's not easy to prevent the wrong use of material design.More importantly, it shows the recent contact (which is nice), but I always send emails to a team of people... It doesn't make much sense when I want to send an email to A, B and C, but the app suggests me to choose one recipient from A, B and C.---I like the profile picture <-> checkbox idea.---I'm still using Mailbox, even though I have to add labels in Gmail again coz it doesn't support that.I'll keep an eye on the update of Inbox :)