It's "okay". I'm very lukewarm about it. I like it better than the Graco travel systems I've used, but I find it clunky and slow to maneuver vs better strollers. Of course I love the KF30, and it's nice that the stroller canopy and the KF canopy meet to provide a nice dark little cave, but as just a stroller, it's really just meh. It does lie almost flat, but the "bassinet" area is really quite small -- didn't fit my larger-than-average 3mo DD2 comfortably. It does remember your recline setting, though, which is a nice feature -- you don't have to reset the seatback each time you collapse and then unfold it. DD1 (37lbs, 42") barely fits in the stroller, and it's REALLY heavy to push with her in it -- does not roll smoothly. It's not truly one-hand maneuverable, either.
So...if I didn't get an awesome deal on the travel system, I'd just go with the KF30 and an adaptor onto a nicer stroller. Right now I'm using the KF30 on top of my old BOB jogger (circa 2007) and loving that combo, even with how huge and heavy the BOB is to get in and out of my Ody. I'm salivating over the B-Readys now that there's that awesome promotion going on...will probably break down and get one soon! The KF30 will snap nicely onto that with the adaptor, I've heard