When I bought my boat last year, it came with a Raymarine C70 "Classic" chartplotter and radar dome, as well as a Garmin 540 chartplotter. No AIS, no sounders. Both units are installed on separate Ram mounts just inside the companionway, and are swung around for visibility underway (boat is tiller steered).
I haven't been happy with the Raymarine unit, primarily because the fonts and graphics appear to be designed for up close viewing (e.g., a power boat helm). In my application, the screen is about four feet in front of me, and I couldn't make out any details without walking forward and leaning down. The system was also complex to operate, at least compared to the Garmin. I didn't use the Radar too much, but it did work.
The Garmin unit, on the other hand, had much bolder fonts and graphics, and was easy to read from the tiller. But the screen real estate was much less than the Raymarine.
So I decided that it was time to upgrade. I experimented with and was impressed by Garmin Bluechart Mobile on my iPad, so I decided to go with a Garmin unit. I found an excellent deal on a second hand (but still in the box) 741xs, and decided to pull the trigger.
I pulled out the old stuff this weekend and installed the new Garmin. Installation was no problem, except that the mounting bracket doesn't mesh well with the Ram mounting plate, so I had to make an adapter plate (plywood for now, black Starboard once I get some). Initial setup was easy, and everything seems to be working just fine.
Like the 540, the fonts and graphics are very easy to see. One thing that did surprise me is that the height of the 741xs screen is actually less than the 540 and Raymarine (3.6 inches vs. 4.0 inches). Although the 741xs has a 7 inch screen (diagonal), it appears that the designers were focused on screen width (perhaps to accommodate a split screen display) more than screen height. I think I would have preferred more height, since I'm more interested in what's out front than what's to the side. But the screen dimensions seem similar to other manufacturer's 7 inch models, so I don't think I could have avoided this, short of choosing a larger screen ($$$).
Consolidating to a single plotter also freed up one of the Ram mounts, so I transferred by VHF to it. Now I can swing the radio out to the cockpit, along with the plotter. Nice!
Next step is to put all the old stuff on eBay