I've used AC on CE for several years, so can try describing it for you....
On the CE screen, there are view tabs at the top of the screen, one of which is "Guide Book". Click that and all the AC marks show up on the chart, color coded per AC standards. Click on any one and all the AC info comes up in a side screen, including reviews.
If you want to comment on an AC mark, you can do it from within CE.
One of the best things is that the AC data base is kept locally on the CE machine so no internet is required. It also saves any comments/reviews that you make. Then, when you have internet, you synchronize and all your reviews get posted to AC, and any updates and changes get downloaded to your CE machine bringing it up to date.
The only thing you can't do from within CE is create a new AC marker. So if you want to report a new anchorage, marine, or whatever, you can't do that from within CE. Maybe this has been fixed with the new enhancements that allow route sharing between CE and AC, but I don't know.
So in summary I'd say the AC integration is quite good, though I do sometimes create new marks and it would be good to have that in CE.