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On the basic version the focuser is fine for visual use but the 2" drawtube and limited backfocus is restrictive for imaging. The Vixen style dovetail bar is not strong enough to hold the scope steady and needs to be changes for a wider bar.
If you only intend to use the scope visually get the basic version and upgrade the dovetail bar.
If you intend to image as well the DX version has a much better focuser along with the better rings/dovetail.
Note that the 150ED isn't designed for imaging and stars will bloat somewhat with broadband imaging, but it still does a reasonable job for the casual imager.
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