Tbh, I'm finding it quite intrusive.
With my former activities on the site as part of the ST there's thousands of threads I'm watching so I could potentially be inundated with notifications if this was coming from all threads rather than just the recent ones I'm watching.
sometimes when new posts are made I'll have a look, if not I'll ignore it or stop watching the thread from the watched threads menu. Is this the beginning of the end of the watched threads menu on the sidebar?