Unless you're within a stone's throw of their ship center (socal) it's going to take at least a week to get a game after you mail one back. It's also a bit expensive, even if they did ship quickly - which they don't.
Really, the abysmal turnaround between games is the biggest issue. If you're near their ship center, it shouldn't be too bad... I'm in Seattle and had to wait at least a week and a half between games. I'd get maybe 2 games per month, with the one-out plan ($15), and would only keep each for a couple days. It was ridiculous.