I've had a variety of experiences with Green Cab, ranging from average to terrible. \n\nTonight, a Friday night, I called a cab at 9:50pm to take me from one end of downtown to the other. Yes, a decently busy time to call, but nothing out of the ordinary. Although I'm willing to wait 15-25 minutes on a Friday night, I'm not willing to wait 50 minutes. By that point, your energy is exhausted from the frustration of waiting. \n\nIn general, Green Cab kind of blows. Yes, they have eco-friendly cars and sweet ipads, but that's really not what I want in a cab service. I'd rather have a short wait time or a reliable estimate if it's a busy period. With Green Cab, there's really no telling when they'll arrive. \n\nI've also had trouble paying on several occasions. Some of the drivers enjoying pulling the old \"my machine is broken\" when you try to pay with credit cards, while others claim not to have any change for your $20. You're a cab driver. Your only responsibility is to drive, accept credit cards, and be able to make change. If you're missing 2 of those 3, you're doin' it wrong. \n\nAlso, if you're waiting for Green Cab and want to see where your cab is, forget it. Rather than placing your call on a hold line, Green Cab routes calls to a busy signal, so you're SOL in terms of following up when it's busy. \n\nOther than that, Green Cab is awesome. \n\nAll in all, I'd stick with Union Cab. You *might* pay more, but it's worth it. Plus, the drivers are way cooler. One even had Cash Cab-style questions ready to ask me at 3am. But maybe you're not into Cash Cab. So then there's always Green Cab.