I have a Zeagle Tech, and my wife has a Zeagle Ranger. We are very happy with them.
We opted out of the backplate route because we travel and dive, therefore lugging around a backplate is a big pain when clearing security. They will always want you to break open your carry on. Also the extra weight is not worth it to us during travel.
My wife is also not a technical diver, and so she has little practical need for a backplate, since she never wears double tanks, so she does not feel like lugging a backplate around.
The Zeagles are modular, and you can take them apart, and roll them up, for travelling. The wing rolls up nicely when disconnected, and the body harness rolls up nicely as well. Both pieces fit nicely into carry-on luggage, or you could stuff them into the corners of your check-in luggage, saving space for you inside the luggage.
They have weight integration pouches, so you do not need a weight belt with them, which is easier on your lower back. This may not matter to you while you are in your 20s and 30s, but once you reach your 40s and 50s it will make a big difference.
The back-inflation wing B/Cs will tend to throw you forward, when they are fully inflated. You can fix this by simply not fully inflating them, at which time they keep you vertical at the surface quite well. It is the most common complaint of new back-inflation users.
Trim is nearly horizontal underwater, and nearly vertical when not swimming at the surface with the Zeagles. Your trim will not be as nearly perfect as with a backplate design, simply because by putting 3 to 6 lbs above your back, the backplates allow you to better control and center your trim. But not having to lug around a backplate has its advantages as well.
As a D/M most scuba stores will want you to showcase their B/Cs, and if they sell Zeagles, then this is a perfect B/C for you as a D/M, since they come with enhanced lift capacity to start with. You will need that enhanced lift capacity as you retrieve dropped weight belts for students, and handle extra weights handed to you by your instructors.
Few if any stores train new divers in backplate-wing gear, and therefore the instructors and owner will normally want you to wear gear similar to the students, with quick-release buckles, etc. If they sell Zeagles, then they will be happy with your wearing one.