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Assuming the Andrews bino's are from the same manufacturer as William Optics/Stellarvue, the main potential problem would be excessive prism misalignment. I'm sure Andrews would swap a bad pair but then you have extra postage to pay. Anyone living within driving distance of the shop could test them at the shop on an overcast, stable day, to check if you can merge the images at 150x.
Stellarvue claim to weed out the bad units reducing your chances of having problems with merging (I don't know if other manufacturers claim to do this quality control).
The Stellarvues I had would reach focus in my Dob with the supplied optical adapter(barlow) and ~1" extension tube. They worked well in my refractor with an Orion shorty plus barlow and they focussed in the sct with no adapter or barlow. A 2x barlow gives something like 3.5x or 4x when used in front of the bino due to the extended optical path.
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