John,
I am 4 months post-op (translab on right side). One of the reasons for choosing the surgery over other options were tests done prior to decision. My good side had compensated 54% of my balance, and I had a 60% hearing loss in the bad ear. I've found that my balance is actually better now than before the surgery. Doc says its because the brain is not getting mixed signals. I am SSD (single sided deaf) but I really haven't noticed that much difference. They say that my balance will only get better as time goes on. Immediately after surgery I had 2 weeks of unsteadiness, but have now found there really isn't anything I can't do, whether being riding roller coasters/amusement park rides with my granddaughter, swimming, riding my bike, or hiking along a 1,000 foot gorge in Colorado. I keep trying to find something I can't do, but it hasn't happened yet.
Good luck on your decisions and on the results
Road Trip Dale