J.B.
I have one and LOVE it. It is the older e3 model which I believe is similar to the Sport. I'd love to have a Vibe because the stroller folds up with both seats attached - but other than that, I'm very happy with the model I own. My kids love the front OR the back, it is easy to push and turn with one hand, fits through doors easily, is super sturdy, etc.
Cons: It IS heavy and bulky to load/unload, especially since my e3 does not lock closed or anything. (I'm not sure if that has been addressed with the newer models.) Also, when a child is sitting in the lower seat, you can't hang a diaper bag on the handle without it bumping the child in the head, and the basket on the bottom is often occupied with little feet, so it isn't a great place to carry things either.
I'm still super happy with mine and haven't found any better alternatives, personally. Though if money were no issue, I would love to get my hands on an iCandy Pear stroller! Good luck.