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The Stellarvues are 22 Oz. I have had mine for about 4 weeks which I use on my Equinox ED120. For me it has been a revelation - having used 'one eye' for 30 odd years. Really, just to reinforce some of the above positive comments. I find bino viewing just so much more relaxing and I actually 'see more' even though each eye is seeing 1/2 the light. [Complex process of light summation and how your brain works]. I can observe for hours with out eyestrain. I use them mainly for planets and lunar observations. For DSO's 'Cyclops' viewing is the best. The Stellarvues use a 2x OCA. [Barlow like nose piece that screws into the B.V.]. I also use my Televue 2x barlow with the bino viewer. With the 2x OCA removed and the extended focal length the TV barlow provides it actually acts as 4x barlow therefore doubling you eyepiece collection.
I do recommend bino viewers with the before above mention issues: not everyone can merge the views, it takes some experimentation with some scopes to reach focus, the added weight, the cost [but using your existing Barlow will help], and the BV’s give a ‘narrow’ FOV [but not necessarily bad with planets].
However for me the benefits easily tip the balance.
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