I have the flyer and I'm really happy with it. I have a Chicco keyfit carseat.I think it is really flexible for different configurations at a decent price for the features. Mine had a slight alignment issue and the customer service was very responsive.
We also have a BOB. Now that DS is older, we tend to use the BOB for walks - since it pushes so smooth. We use the bumbleride for the mall and out and about.