We've been at this for a while now. No meds for over 6 months and on the diet for 4.5 months. Our son is doing reasonably well -- feels good and does not complain of tummy pain. I definitely think he went through a 3-month rut that sounds common on the SCD. He seems over that now, though still goes 2-3 oatmeal-consistency poohs a day (with a little blood). That seems tolerable to me and worth the burden of the diet.
On a financial note, we definitely spend more per month on food with this diet. Pre-diet, we budgeted $800 per month for food... though we've now been spending $1200 per month for a family of four. Shopping at Whole Foods and Trader Joe's seems to be adding up! Also, we no longer go out to eat... so we're saving some $$$ on that front.