Hm yet its leaky, buggy and low-feature. Useful for casual use but nowhere near professional. When will they drop it, or break it? Like some gmail features got broken this week.
Lesson: don't hang anything important on Google apps.
Google docs is fantastic. I use it exclusively (docs and sheets) and haven't seen anything buggy about it. I have never found myself a wanting a feature in google docs that wasn't also missing from Office. The only limitation I came across in sheets was the limited scope of conditional formatting. That's pretty much it.
FWIW there are a few features I would love to have in docs: different headers/footers for title pages pops out to me. Sheets is a LOT less featured then excel but the scripting is pretty excellent so that actually makes it a better product for most of what I want to do. Plus who really uses the advanced features of excel?
Lesson: don't hang anything important on Google apps.