As a Fastmail user for both personal use, as well as for my business, the best thing I can say about them is that I haven't thought about them in...a decade?
We built a Discord integration so that new emails to our support address would ping us in a Discord channel using the JMAP API. It's only failed to work once that I can recall - and that ultimately ending up being on Discord - not Fastmail.
Just rock solid service all around with no bullshit.
Completely agree on all points. We've had dual remotes running on a few high traffic repos pushing to both GitLab and GitHub simultaneously as a debug mechanism and our experiences mirror yours.
We use GitLab on the daily. Roughly 200 repos pushing to ~20 on any given day. There have been a few small, unpublished outages that we determined were server side since we have a geo-distributed team, but as a platform seems far more stable than 5-6 years ago.
My only real current complaint is that the webhooks that are supposed to fire in repo activity have been a little flaky for us over the past 6-8 months. We have a pretty robust chatops system in play, so these things are highly noticeable to our team. It’s generally consistent, but we’ve had hooks fail to post to our systems on a few different occasions which forced us to chase up threads until we determined our operator ingestion service never even received the hooks.
They absolutely can and will say it's all of those things - and for the most part the client will be none the wiser. It's practically the first step in relationship building for most agency pipelines.
We built a Discord integration so that new emails to our support address would ping us in a Discord channel using the JMAP API. It's only failed to work once that I can recall - and that ultimately ending up being on Discord - not Fastmail.
Just rock solid service all around with no bullshit.