I have a Fly2; the version with the high-crown hood. It is a fine stroller, *very* light and very compact. IMO, its flaws are that it does not have a basket, and the harness is only 3-pt.
The handles and the hood are quite tall, and the seat is very comfortable. DS still fits fine in it at 44 inches tall.
That said, like just about all lightweight umbrella-fold strollers, it has a problem w/ maneuverability when a child exceeds 30 lbs. (It's not awkward, mind you, just becomes
rather a chore to steer because it takes some effort with that kind of load.) A Combi won't help with this problem, either, I find that Combi steering suffers at 25 lbs and above (also, since they are low to the ground, lots of parents find their children are uncomfortable with their knees scrunched up.) A Peg Pliko *might* get past the maneuvering problem, but a Pliko is considerably heavier than a Fly2; it's a good stroller, but heavy for its type. (The Chicco 2002 is very much the same design and weight, though it's hood is taller.)
We decided to invest in a Maclaren because of this issue, and we *love* the Maclaren,
which still steers effortlessly even though DS has reached its 40-lb. warranty limit.
However, I can understand that you may not want to invest that much. I can recommend the Fly if you are getting a good price on it; we do still use ours. (BTW: the add-on basket for the Peg Pliko will fit on a Fly, as will the add-on baskets available for Maclarens.)
By the way, in case anyone is interested, I recently found out which strollers have the highest load limits; both are joggers. The Kelty Joyrider goes up to 75 lbs., and the Mountain Buggy will accept just over 100 lbs. Both of these strollers retail for over $300; the Kelty is American, the Mountain Buggy is imported from New Zealand. (The Kelty is unique because it is an umbrella-fold jogger; the 12-inch wheel version folds amazingly compact for a jogger. The Mountain Buggy Urban is also somewhat unique, it has a swivel front wheel.)