Just a heads up. I hate badmouthing companies, but... I wanted to use them instead of Google but my standard .com domain kept error int out in there interface and multiple support emails and posts in their support forum went unanswered so I bailed back to Google.

I wanted to like them, but their signup and support experience was terrible. Their other products seemed to work well, but they've lost me as a customer.

The founder, Sridhar, is on here: https://news.ycombinator.com/user?id=sridharvembu

Very talented and humble guy.

Just treat it like google, or AWS - you're not going to use all their services and you don't need to. The things I'm using I'm really happy with.

Email just works. No thrills there. Using a custom domain.

Invoicing is pretty simple and I like that tracking payments and payment processors are integrated.

Docs are pretty good. They allow both storing files in arbitrary structure and tagging them at the same time. There's a phone app which I used once or twice and it's ok.

In general, I like it. It supports 2FA. If they let me pay for the service I would (5 users minimum, there's no cheap single-user subscription). It's kind of like an office suite - you're not going to praise how great it is, there are some obscure issues out there, but it works year after year for me and I'm happy to use it. While it may have happened, I can't remember any outage of their service.

I moved from Zoho to Fastmail last December when their continuous outage almost ruined my job search process.

I first heard of them in 2007, so they've been around a while. I haven't used their products much though.