I have a JRC radar and like it a lot. One thing about NOT integrating to one screen is that you gain redundancy. If the GPS/Chartplotter fails for some reason, you may still have a radar.
No experience base with this, but looking at the combined unit demo displays they are too "clean". Radar that is adjusted properly should show some wave top returns. The combined units may be filtering information so the display looks good with the chart readable underneath the radar overlay.
I run the display on the GPS "course up" so both it and the radar have the same orientation. I just glance from one to the other, it is easy to identify comon geographic features on both units once you learn how to read a radar screen.
I bought a couple of "how to" radar books, there was a lot of information about how to use radar than is in the manual. They were good investments.
Have boat, will travel.