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I have the Denkmeier "Big Easy" binoviewer...
I am not a "technical" observer but enjoy the "art" of viewing...
I like to use them on the moon and planets...DSO (deep sky objects) can be a bit dissappointing depending on the aperture of the scope that you are using.
I have used them in on my Skywatcher ED 80 and enjoy the daylights out of it on the moon...most planets are pretty cool too.
I have used them in an 8 inch Bintel (GSO) Dobsonian mounted Newtonian reflector...again the moon is glorious...Orion Nebula and a few of the other big name nebula are okay.
I have used them in my 12.5 in Discovery Truss style Dobsonian mounted Newtonian relector...DSO are better better than on the other two scopes but still not great...the views remind me of viewing DSO through the smaller scopes...
The DSO views are okay but not breathtaking...to me and in my opinion, the moon and planets are breathtaking...
As has been already noted, you will most likely need an OCS (depending on your scope) and some scopes have difficulty focusing with extensions for focuser tubes or an OCS...
I have 3 sets of eyepieces that I use...21 mm Denkmeier, 15 mm Televue Plossls, 8 mmm TMB Planetary...
(I will also now confess for the first time that I have ordered a pair of Denkmeier 14 mm even my wife does not know this information yet...and based on how nice the 21 mm Denks are these should be great...but the TV plossls do a really nice job too I was just in the mood to "upscale" a bit)...
I have not tried them yet for solar viewing but I imagine that they will work well with a properly filtered scope.
Again as noted previously please try some before you buy if possible...while I have not had any difficulties with merging, some people do.
I've enjoyed them because of the easy and comfortable view that they provide, I just get drawn into longer and longer watching thereby picking out more detail...
Clear Skies!
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