Back from Gran Cayman after diving one week aboard Aggressor V, most in Little Cayman.
Have a better feel for the monitor, advantages, disadvantages etc. Will not take into consideration the price since it could be a factor without taking anything else into consideration, its is an expensive proposition.
For wide angle its a nice addition but not something you need or have to have in any way. Wide angle being the only application, I would not bother with the monitor at all, having a 45 degree or 180 degree finder makes shooting easy and accurate. Again it is a nice addition to have.
For macro does make a difference in many ways, listing in no particular order. First thing I noticed is being able to shoot comfortably & accurately while being safely off the reef. Hover a a few inches off, one finger bracing and one hand camera operation, easy. Love being able to see the subject clearly. On my camera (OMD 1 Mk2) use the continuous tracking, release priority and back button activation. Being able to see when the subject is in sharp focus is a premium, no problem. Working for exerted time on one subject, easy without tiring. Being able to shoot at the correct angle comfortable without tiring, a new experience. Could go on and on, I guess you figure I like it !!
The down side has to be weight and bulk. Can see how it would be a factor on a crowded dive boat, on the Aggressor was no problem. Swimming with a current becomes more of a challenge and need to find a way to hold for best efficiency. Found holding by the lanyard, left hand and trailing/overlapping my left leg seem to be the easiest. Diving in a strong current needing to make your way to the anchor line pulling yourself would not be a pleasant. Still will give a try next time I go to the Keys, plenty of current on some of the wrecks.
Do almost all still photography but since I had the monitor tried some video. After my first all video dive, like it so much that decided to do a couple of more. Can see myself doing a little more video, particularly macro using a tripod.
Hope this gives you a idea for the monitor. btw agree totally on the suggestion above for the iPhone as a monitor. Would not mind if a housing had on incorporated (inside) at a 45 degree angle. Would not have the versatility of the articulating external monitor but the convenience would make it a much better set up.