The 275 is really nice. I figured that the G5 would do the job, and is much cheaper, so that's why I went the way I did. And really, I'm quite happy with the G5. I have no issues at all with the G5 standby gyro, and my one issue with the G5 as the copilot HSI is that it would be much easier to use if it had a second knob. Less pressing, scrolling, pressing, dialing...