The reader is pretty instantaneous in my opinion. It changes faster than the OEM gauges in the Accord, so I think it goes pretty fast. I'm not sure how the speed will compare to a Scan Gauge, but I'd estimate that they run at about the same speed, since the phone's processor is much faster than the SG's processor.
I got the cheapest dongle as well and it works amazingly well. When I had the Torque app the bluetooth didn't want to connect, but when I started using DashCommand it connects almost instantly. Once you click the connect button and the key is in ACC then it will connect.
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