Just started up with Gamefly. The 'summer deal' (pay for one month, get a second free) seemed like a pretty good way to test drive the system. Since we have a PS2, DS, and a Wii, there's a lot of content to choose from. Plus, I like the fact that many games are available on two platforms. So... I can add games like Wall-E twice(Wii and PS2). Whichever one comes up first allows me to cancel the second. Or keep it, if I am really interested in seeing the differences.
I had read that GF has the ability to know when you drop a game(barcode scanned at postoffice) in the mail so it can immediately fire off the next game in the que. I haven't seemed to notice any drastic turnaround, though. Seems like my game had to hit the dispatch center at GF Pittsburgh, before they sent along the next title.
That said... we're enjoying it, and it beats spending $50 on a new Wii game that may be less than spectacular.