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Binoviewers can work well in a Dobsonian reflector but they will need an OCS (Optical Corrector System) of some description.
You will also need to ensure that you have a way to maintain balance (Bino, eyepieces and OCS) can add considerably more weight at the eyepiece...oh and you will need to see if your focuser is up for that too.
I've not had a lot of experience with "the cheap" brands but I think very highly of my Denk "Big Easy" bioviewer set that I picked up a few years ago. It came with an OCS and is usuable in all kinds of scope (SCT, Reflector and Refractor)...I've not had a problem yet. Like all things optical, you will likely get what you paid for...
You will lose just a bit in light throughput in the best binoviewers and could lose a lot in the worst...remember they are splitting the light that normally goes to one eye in two...poor and uneven splitting will cause poorer quality views...
I really enjoy mine on bright objects (moon, planets) and I think they do well on "easy" DSOs (Orion Nebula)...however, if you are looking for that distant galaxy at the limit of your scope's ability you are better off with Monovision me thinks...
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