I use it and I like it well enough. It's kind of slow, though. It can stake up to a week between games. It is nice to be able to finish a game without having to worry about late fees or angry phone calls from BB.
USPS has a service called “fast return” which is something GF uses to get games to you faster. When the mail gets picked up and logged, GF sends out another game automatically. The only problem is that the post office only logs the game every so often and I have no idea how to make them do it all the time. So, sometimes the turnaround is great.