I know exactly what you mean!  Ooohhh, when I think of all the times I got an aching back when grooming.... 
I've been trying for months to decide whether to get a table, or just the arm, or even anything at all.  I finally realized I already had the perfect comfortable setup (for me), I just need a way to keep them from moving around so much. 

  I was watching my groomer last week and another groomer at Petsmart on Tuesday, and the dogs did so well on those small little tables the groomers were using.  It seemed like they couldn't move too much with those bands looped on them.  Like I said, I've never used a grooming table or a grooming arm/band so I hope this does the trick for us.  
 
     
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 He is your friend, your partner, your defender, your dog. You are his life, his love, his leader. He will be yours, faithful and true, to the last beat of his heart. You owe it to him to be worthy of such devotion. -- Author Unknown