Correct, you don't need special glass if you have Pinstadiums.
My HUO Houdini came with both Pinstadiums and AP's version of Invisiglass. I moved the glass over to my MMR just to see for myself if it really works (it does) -- but what's relevant here is that Houdini looked just as good with regular glass b/c of the Pinstadiums.
So my vote is pinstadiums and color dmd tied for first, far ahead of invisiglass.