I only upload ePub to Amazon.
I do check sanity on a DXG, both modes on a Kindle Keyboard and on a PW3.
If we do something different we might do a test purchase of KFX and mobi using two accounts and real kindles.
We upload epub2, dual Kindle (mobi/KF8) and MS Doc to Smashwords. Smashwords doesn't do perfect epub2 or kindle conversions and also doesn't know which Kindle people have.
I only "preview" in Calibre's ebook viewer. Serious checking is done on Android Apps, eInk Kindles, Sony PRS350, and two Kobos but only when we change a style or try a new feature.
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