I'm very happy with my G496. The 495 wasn't about when I got it, otherwise I'd have got the 495 as I have never used the "car" or "boat" functions.
Great unit, great capabilities, and we have it "panel mounted" using an Air Gizmo thingy with external hull mounted antenna. I've also wired it into the intercom so the speach gets relayed into the headsets - there are speach warnings you can set up, like off course, terrain, altitude etc. The VRP dB is very useful too.....