I have an STEC-30 and have an ST-901 GPSS unit with it. I am considering adding dual G5s to my Dakota which have GPSS. Is there any difference between the quality of the GPSS in the ST-901 vs the G5? A friend has a Twin Comanche with dual Aspens and and S-TEC 55x. I believe he uses the GPSS in the Aspen as he thinks it is a bit more aggressive than the one in the 55x. Thoughts? Also - with my ST-901 I have a GPSS/HDG toggle button to switch modes. Is there a similar button on the G5?