I've got a baby jogger city mini gt double and love everything about it. I had the bjcmgt single for ds1 and that was the clincher. When friends around me had 3 different prams for 3 different uses, i used my gt only and it served all purposes.
The double has been great for the twins since birth. I didn't buy extra capsule or bassinets, just laid flat and put in 2 snuggler supports which I use as pram liners too.
We live next door to a park and shopping centre so the no pump, all terrain wheels are great thru sand, grass and gravel that we need to travel thru. I've also taken it jogging even tho they say it's not a jogging pram.
I got the glider board attachment for those times when my 2yo ds doesn't want to walk.
The only thing I'd say is it's a bit heavy to lift (not steer, you can steer that sucker one handed). It fits thru the smallest of doorways and aisles, has a one step fold and u don't have to dismantle any bits to put it in the car. I actually borrowed my friend's city select to compare and was over taking off the seats in one day and it was a bit heavier anyway! I also didn't like the long road train feel of a front and back arrangement. With the side by side you don't have to take the seats off. It's quite heavy to lift into the back of my prado, but you're hard pressed to get a lighter double and might be less trouble in a smaller suv. I had a Honda crv but we needed to fit 3 car seats across the back. I liked the look and sound of the donkey, but the price tag was too much and the thought of dismantling every time too.