If only "pretty quick" and "pretty good speed" were reliable metrics to go by.
I've yet to find a car charger that will get more than 1.1amps on the meter. Max is 1.8.
1.1amps is enough to charge the phone "pretty quick" normally, but not if it is loaded down. Once I get GPS, bluetooth audio and Torque Pro going at the same time, I find that 1.1amps will actually result in a slow drain. I use an inverter and a stock wall charger which keeps the phone charging even at full use. I've yet to find a aftermarket car charger that will do the job.