It needs some work Rated 3 out of 5 stars
The whole concept of tab grouping really is more trouble than it is worth. I gave this one a try and although it was one of the better group mangers it also created a number of issues too.
Personally I prefer a toolbar button instead of a dropdown menu- but that is a personal choice. However, the menu also can't be toggled so it pushed my already crowded menubar into squeezing my search area.
The main issue I had was it was creating numbered tab groups that don't exist. Now I was able to go in there and fix things after some tinkering but for the non-technical masses that is too much to ask.
The bottom line is tab grouping isn't worth it until someone does a complete overhaul and makes it granny-proof.