I have samples a number of gluten free beers this last year and a half. So far, I found all sorghum based beers to range from icky to meh. My wife is very sensitive to gluten. sadly she also love big, hoppy beers. I plan to come up with a drinkable, hoppy, balanced beer that she can drink.
The two commercial gluten free beers I thought were the best are Omission Pale Ale and Harvester IPA.
Omission is brewed with a low protein barley and employ enzymes to remove the gluten. I think Clarix or Clarex is added after primary fermentation to cleave up the gluten. It still has some level of gluten but is below the level needed to be considered gluten free.
Harvester was made with a variety of ingredients including oats, nuts and sorghum and was nicely hopped. This was my fav as it was pretty hoppy. Unfortunately it is not sold in CA yet.