Used it for a couple of years and it's far better than nothing. It's saved me from a few bad crashes and assists in organizing tabs a bit. But for the last year I consistently find the UI is laggy, unresponsive, and sometimes impossible to use. I understand taking a while to load large tab lists, but quite often it fails to display all my sessions, button clicks don't register, and other basic errors. Otherwise, it's great, but it has become a frustrating experience to use.