Comment # 65 on bug 1063638 from Eric Schirra

(In reply to Richard Brown from comment #63)
> (In reply to Gabor Katona from comment #61)
> 
> > Yes, you are right, I was not precise. However, despite marking quotas and
> > qgroups as experimental, these are enabled by default in opensuse. And this
> > should be changed immediately. Btrfs as presented in opensuse is
> > experimental without under the hood tweaking.
> 
> quotas and qgroups are not experimental
> 
> https://btrfs.wiki.kernel.org/index.php/Status
> 
> They are defined as "safe for general use, there are some known problems
> that do not affect majority of users"

This isn't right.
In your link is:

Quotas, qgroups | mostly OK | tbd | mostly OK |    qgroups with many snapshots
slows down balance 

This shows accurate the problems: mostly and slows down!!

For me, this is not stable.