We are extremely happy with this stroller overall! After researching for weeks, we found the Schwinn strollers to be very comparable to much more expensive brands - even surpassing the designer strollers in some aspects.
I have a 2 1/2 year old daughter and an 11 month old son. Both children fit comfortably in the seats and really seem to enjoy the smooth ride. No issues with the harnesses, seat design or sun shades. Everything works out really well.
There are a few small drawbacks, as with any stroller. First off, we have found that this model is about an inch too wide for most doorways, including our front door. Stores that have those security sensors by the exits can be a little tricky too, as well as some grocery store checkout lines.
Second, the snack trays appear to be unusually far forward. When the kids are securely fastened in, they do have to really strain to reach that sippy cup. I suppose the up side to that would be that there's absolutely no issue fitting bulky winter coats and blankets into the seats.
Third - and I think this is just par for the course - it's heavy and bulky. We have a Ford Escape, and it pretty much takes up the whole trunk.
I wish the storage compartment were a little larger (and not cut in half by that strange, center divider), but I can still fit essentials in there without much issue.
As a jogger:
We are out at least three times a week for jogging and power walking. To be fair, we're not going long distances - under 10 miles a week - but the stroller handles it wonderfully! So long as the front wheel is locked, you can feel confident getting up some speed. The kids do not get jostled around, and the stroller handles changes in terrain without issue. The wrist strap is great for your peace of mind, especially if you're jogging down hills a lot. You could probably push this thing with one finger if you were on a straightaway. Really great handling!
If you're a more serious runner, you will probably want something with a fixed front wheel.
As an everyday stroller:
The handling on this stroller is awesome! You can maneuver around almost anything, and it hops on and off curbs without any problems!
The adjustable shades and (comparatively) light colors make for a really cool and comfy ride for the kids. The seats backs are adjustable to pretty much any angle, which is great if you have kids on different nap schedules.
Each child does have their own space, which is important. No need to worry about them being squashed together and fussing at each other. Still, they're not SO isolated that they couldn't play peek-a-boo or pass toys back and forth.
The parent console rocks! Those cupholders really grab and hold bottles, and there's a little closing compartment for keys, phone, etc.
Again, we're very pleased overall! I do recommend getting the stroller from Walmart if you're considering a purchase. We saved a considerable amount of money over other websites. Also, the "site to store" option meant we paid nothing for shipping! Really a great deal... especially when you look at the prices of some of the other double joggers out there.