Wow, I though that truth site had cheerleaders.
First, my point isn't that you can't overlay ais on a nav chart. You absolutely can and it works well.
What it won't do is overlay radar AND ais on the same chart. You have to choose. Same with weather. You can overlay one item, and only one item on the nav chart, but not the fishing chart.
That is limiting. Just like you can't choose which data boxes you want. You have to display what Garmin decides you need.
I don't doubt the 6212 is a better machine than the 4212. But it has nothing the NSE12 doesn't have, and the NSE12 has much more, and is cheaper to boot.
As for the gsd22, if you don't fish, it will work very well. I have no issues with it as a depthfinder. I have a 1kw ducer on it and it holds bottom well till about 1500 feet in not calm water. What it sucks at is showing returns on the bottom, or in the water column.
One pretty annoying feature of the gsd22 is that once it loses bottom, it won't show any returns. It hunts for bottom and won't show midwater fish. I don't really care what's on the bottom in 2000 feet of water, but I do care what is at 100 or 200 feet and I can't see that. Raymarine, Furuno, and Simrad don't behave this way.
As for the 24HD, when the water gets choppy and rough, the main bang area is huge. It blacks out the entire inner ring of whatever range scale you choose and then some. I can tune the sea clutter, but then I lose small targets. It is very frustrating to be blind in bad conditions. Other radars don't behave like that. In calm water, it runs well, but I need it when the weather is bad, not just when it's nice. Then there is the brain dead guard zone functionality (which is better on the 4212 than the 3210, but still doesn't hold a candle to ray or furuno).
So Garmin is good as long as you don't demand a lot from it. The sounder is good as long as you don't fish, the radar is good as long as you only go out in calm weather.
Garmin is user friendly, as long as you want exactly what Garmin has decided to display. It has a lot of features, as long as you don't expect them to be very deep.
If you like it though, great. I'm not saying you are wrong. It just doesn't meet my needs. It falls far short.