NU,
I essentially have no need to photograph things I cannot see.
This is a big part of my answer
If you are dealing with stationary subjects and you know the section you want to photograph... and... you find that you very rarely desire to exceed the 60X on sensor you have shown here then I would say no. But...
Where a "full-fledged" microscope is wonderful is when you are exploring and examining subjects and have no pre-conceived "target" area. It's also great with live subjects. Even though I have my camera hooked up to a HD screen, and the screen image looks great, I find I still greatly prefer to observe and study subjects through the optical eyepieces. So often you will find details and subjects that were not obvious to the eye or through a stereo scope.
As far as image quality goes, you will actually do as good or better with direct projection (as you are now doing) up to roughly the 60X magnification you are using. However, if your subjects are in fluids then a cover slip is desirable (as the liquid surface can act as a distorting lens). And with a 60/0.7 M Plan (designed for no cover-slip) you are getting into the NA range where, if you shoot through a cover, image quality will start to decline. (I've got the "numbers" for this at home but I'm traveling this week).
And, photography through a microscope seems to be a real hassle.
The actual photography is probably simpler in many ways. The hassle however, is in initially getting everything set up right. The connection (mechanically, and more important, optically) between the microscope and camera can be tricky, or expensive, or both. If you are not using electronic flash (another "hassle" to initially set up) then your camera body selection is important, as a microscope mounted camera that creates any significant vibration will require special techniques.