We have owned many baby strollers due to having four kids and dh managing and owning baby stores. This is my experience, but YMMV.
We rented a double City Mini at Disney World when our kids were 6, 4 and 2 and they were all quite comfortable taking turns sitting in it, and this was before the GT was available. The double Bob is a beast and unless you need to jog with and it have a really really really wide jogging trail, I absolutely would not buy it. Even a single Bob, which I have owned and loved, is a huge and heavy stroller. I much preferred my City Minis for ease of folding, lightweight, compact in trunk, etc. Now that they have the good wheels on the GT, I don't see getting a Bob, and won't when #5 is born, even though I loved them in the past. If you run a lot and need that functionality, fine, get it, but it is just so big.
We rented a double City Mini at Disney World when our kids were 6, 4 and 2 and they were all quite comfortable taking turns sitting in it, and this was before the GT was available. The double Bob is a beast and unless you need to jog with and it have a really really really wide jogging trail, I absolutely would not buy it. Even a single Bob, which I have owned and loved, is a huge and heavy stroller. I much preferred my City Minis for ease of folding, lightweight, compact in trunk, etc. Now that they have the good wheels on the GT, I don't see getting a Bob, and won't when #5 is born, even though I loved them in the past. If you run a lot and need that functionality, fine, get it, but it is just so big.