I tried gluten free for at least 6 weeks and didn't notice a difference. I was trying it more for my joints, but didn't notice much in my GI system, either. I did notice I craved sweets less, which was good for my diabetes
I still each mostly GF because my boyfriend has to eat GF and I really don't think it does much for me. Stopping drinking milk did help me, though.
Sometimes when I would go out it would be really hard to find gluten free options when all I wanted was a snack, so at times it was a little frustrating.
Just to warn you the first 3-6 days I was VERY constipated, but the constipation went away afterwards and didn't come back. So if you get constipated, don't worry it will go away soon enough.
Bobs Red Mill makes a pretty good mix for pizza dough and also a good all purpose flour which I use often. Udi's bread is pretty good and is generally found in the frozen section.