[LostKiwi]

I have the G5 installed as an AH and can speak very highly of it. Moderately confident I'm the first 337 driver to install one.
Its very clear and bright and readable, regardless of light conditions (has a light sensor in it, auto dims as needed) Info is easy to interpret, altitude presets are super handy, you get a lot of bang for the buck. Plus... it makes the panel look super cool!

Right out of the box it has the HSI as an option, but installed in the AH slot you have to disable that as part of the STC. Of course I sat there and played with it before i disabled it... Its pretty schweet!
You can have the full circle, or the half circle. I think from memory it has the VOR's and traffic on it as an over lay - sorta moving map styles. Don't quote me on that though.

Before you pull the trigger, check with Garmin about the 2 for 1 deal. I'm pretty sure they are offering a combo of the AH and the HSI together, and it was a bunch cheaper than trying to buy them individually.

Leighton.