I started playing on GG about 7 months ago. It was a spontaneous decision—and not necessarily the best one.
I began with $50, and now I'm at $275 plus $150 in C$. So overall, I’ve won $370. (Note: the $150 in C$ must be used in raked games before it can be withdrawn.)
The problem with my decision was that I wasn’t properly prepared for GG. They offer something called a "Honeymoon" period—30 days from when you first register—where you can complete daily challenges (just by playing cash games). These challenges reward you with free tickets, tournament entries, and even cash. If I had known about this in advance, I would have signed up during a time when I had more free time to take full advantage of it.
Another mistake was that I later read (though it's not confirmed) that signing up through an affiliate link might give you extra free games. That could have been beneficial too.
That said, I'm still happy overall. You get three $0.25 tickets per week and one $1 ticket, which you can use for Spin & Gold or Mystery Bounty games.
So far, I don’t regret playing on GG.