Rated 5 out of 5 stars
I've been running TabGroups Manager with other addons like TMP, Session Manager, BarTab and about 30 other active addons.
In month or two i've been keeping the same set of tabs between sessions and currently running at 1500 tabs, inside 30 or so groups. So far i've seen only couple occasions where the tabs didn't stay inside their group after restoring session. Also with this many groups, it's starting to get bit tedious to manage them and more tabs you get slower the startup time is. Even with 1500 tabs, when using BarTab, it takes omly about 10-15 seconds to sort all tabs into their groups.
Overall this addon plays nice with other addons i've used so far and it is quite stable. Recommend this to any "tab maniacs" out there. :)