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There is absolutely nothing wrong with viewing the planets with the ED80. The views are impressive up to 150-180x given the right eyepiece. In fact there would be many a night when the ED80 would show a better image than an 8" Newt. Of course under very good seeing conditions the Newt would excel.
Note the ED80 can be considered as a poor mans Tele Vue TV76/TV85. I don't own a TV76/TV85 but do have the TV60, ED80 and TV101 and visually I do prefer the clean views they give with almost no cool down time required. The only thing lacking in a refractor is the brighter images capable in a larger instrument at the same magnification.
As for astrophotography, when the ED80 first came out it was the instrument of choice for many (mainly due to low cost). You will need a reducer/corrector/field flattener of some sort. (The older model William Optics 0.8x (II) works well).
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