Wow what a coincidence — I switched from Gmail to Fastmail exactly 1 year ago today. I couldn't be happier. I mostly use native clients, but the Web client is a joy to use, and everything I've observed about Fastmail gives me confidence in their service. I never used the Gmail-exclusive features like labels, so switching was pretty easy. I highly recommend it to anyone considering it. Keep up the good work, guys.
I'm considering switching (in fact I just registered for the FastMail trial). I'm especially interested in the ability to use catchall addresses with a custom domain, which would allow me to give out an address like , and thus determine who shared my email address if I start receiving spam at that address. This is partly possible with Gmail, as you can use addresses like , but not all sites support emails with a + in…
You're probably considering switching based on your mail needs, so this might not apply to you, however:
In addition to mail, Fastmail also advertises[1] their plans come with their FastMail Files feature. It can be used for one-off file sharing (akin to Google Drive) and even static site hosting (explained in their support docs[2]). However, I learned from the CEO's comments in my support ticket that they're apparently overprovisioned and don't expect everyone to actually use the storage included with their plans.
I just took a cursory look at their landing and pricing pages and see they aren't touting Files loudly right now. (My initial thought is a hope that they took my remarks to heart from the thread that led to my decision to leave, when I said they should "go tone down the hosted storage aspect of your marketing". However, given that the promotional blog post from [1] occurred within the month that followed my comment, I suspect not.) The blog posts and Fastmail documentation[3] about the Files feature are still available, of course, whether or not it's still on the landing page.
This itself would have been only slightly disappointing, but the bad taste came from the passive aggressive responses in the support thread, that this was the same sort of attitude adopted in a previous (unrelated) support thread from a couple years ago, and that in this most recent incident, they decided to go on the offensive and compare using the 25GB storage space for making backups to abuse. (Their choice example being someone trying to abuse an ISP's lax limits on DNS to tunnel IP over it.) I half expect someone to show up here to try and apply a layer of spin in exactly the same way. Bonus points if they ignore my actual use case, try to make it out as if I was trying to do something I wasn't, and then call me the "disingenuous" one again.
1. https://blog.fastmail.com/2017/03/29/faster-files/