Did you watch the video I posted in this thread where Dr. Matt is using 900X with an expensive USB scope on an expensive stand? I'm not sure what the ideal magnification is, and I've only used low magnification and what Plugable says is 200X (I have no reason to doubt they're correct on that).Yeah, with the incline, it's minimal. It's not terrible with the blade perpendicular to the scope... so it'll be best if I can work out a platform where the incline can be adjusted on the fly, but stability will take precedence.
That said, I'll probably be picking up a 25x objective, as everything will be much easier at a little lower mag (it's pretty easy to work with at 200x)... then once I have things sorted out, maybe try testing the limitations at 800x again.
From using other "real" microscopes in research and professional settings (not recently but long ago) I know some of the pitfalls they present as the magnification increases. Maybe 200X or something not much higher than that is the ideal magnification for looking at razors, but you'll be in a great position to figure that out once you get this scope all sorted.
I've been pretty much amazed at what I can see with the Plugable at 10X.