I have a 1hz GPS with NMEA protocol and it updates every 2 seconds, that happens to many NMEA 1hz devices. With the Sirf protocol it updates every second and with a lot more information.
As Sirf is a very specific native protocol from Sirf chips, I understand is not supported, but it will be a big improvement.
Comments
If there was some killer 10 Hz Sirf device it would be no problem to implement this binary protocol, but for current 1 Hz receivers it's hard to see the benefit.