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Hi Bo,
I have the WO binoviewer package: Binoviewer body, 1.6x barlow/corrector, and a pair of 20mm (66deg) WO eyepieces. I actually purchased two complete packages from the Williams Optics shop located on Ebay US$199 each plus US$14.99 postage. The items arrived at my address in NZ in four days (super quick). Of course I tested both both systems in my 14"f5.09 dob. One unit was sharper overall than the other, but really both performed ok. I had no trouble merging images with either set,(apparently some folk do have some difficulty in this respect). I kept the better performing unit and moved the other on, so the exercise did not cost me). I did have to move the secondary mirror 1.5-1.75 inches closer to the primary to get enough "infocus".
The binoviewers have revolutionised my viewing of moon, planets, globulars, nebulae etc. The claim is that two eyed viewing ups contrast and resolution by up to 40%. Plus the 3-D effect is jaw-dropping.
I dont think the Stellavue units come with correctors or eyepieces.
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