I have the city x3 double. And LOVE it. DH takes it running, locking the front wheel that thing doesn't budge locked. I take it walking. We also take it to the zoo, musuems, cities (as long as we don't need to take a trolley or bus), its been almost everywhere. The lighter blue, which I have its a lot lighter in person btw, does get dirty fast but its easily spot cleaned, I haven't been brave enough to wash it yet.
The seat backs are very tall, canopies are awesome, the bar we take off but it does fit most infant seats with the bar on, just not the KF30. It can fold down small if you lower both seats, then fold, take off all wheels. It's really compact that way. It fits in my trunk of my Galant.
What else, the recline is amazing, good airflow as you can take off the back canopy area and breeze goes right through. has tons of storage space. just don't pack underneath too full at the front as the mesh up there isn't tall and it will fall through or hang through to the wheel. But easily resolved by shoving things toward the back. Both seats have large pockets on the back side. Kids seats have a small pocket each but don't fit really anything other then small toys. But if they are like my kids they need that small toy with them, it helps because you know it won't get dropped and its still close to the kid.
ETA: The handle on it is very comfy, we both love it!
Another mom in my neighborhood has a double bob rev. swivel wheel, we compared at the park and even she liked my Tike Tech better for smoothness of ride.