Bob Duallie or Summit x3?

arw060310

I'm shopping for a double jogger. I have a 16lb 3 month old and a 30lb 2.5 year old. (No worries, not running with the little till we get the thumbs up from the Dr). I have a Bob Revolution single that I LOVE. But I'm concerned the about the "saggy seat" complains and the extra length. The Summit x3 double is noticeably shorter but wider. The seats have more support but I'm worried the quality won't live up to my standards since the Bob is basically amazing. I plan on training for a half in the future and my 2.5 year old is showing No signs of growing bored of the stroller. My 6" husband will use it occasionally and he is very fast (leaning toward the Bob Flex for him).
Any recommendations? They are so expensive to blindly purchase one (I don't have a store near me)