I recently purchased this bike trailer after researching several of the other mid-range 2-in-1 Double bike trailers. This one has all the features of the others and more, but does have a few short-comings.
PROS:
1. It's one of the roomier models for two children
2. It has a full front wheel attachment for Stroller/Jogger mode and has an included hand brake
3. It has two adjustable 5-point harnesses that work as intended
4. It has a nicely cushioned seat, and extra protection under the footbed to reduce tears
5. It has 20" outrigger style wheels that roll smoothly and easily
6. You can buy additonal couplers for multiple bikes
7. The protective covers attach securely with Velcro in multiple places and it has an ample rear storage area
8. The bike tow bar tucks neatly under the trailer when in Jogger mode
9. The Jogger bar can remain attached with wheel in storage area if preferred
10. It is priced lower than comparable brands/models
11. It is well-made, uses good hardware and materials and looks great
CONS:
1. In Jogger mode with two children inside it can tip backwards if not attended due to center of gravity being directly over axle and backrest angle
2. The coupler will not fit as intended on bikes with quick-release wheels. The coupler is designed to fit rear axles that are held on by screw nuts. (Note: I was able to mount it another way via disc brake mounting holes at left rear frame arm)
3. The seat is directly over the axle and although it is nicely padded it causes the passenger(s) to be leaned forward a bit
4. The backrest forces the passenger(s) head forward when wearing a helmet which may be uncomfortable on long rides
5. The flag that comes with it is wimpy and flimsy, but is an easy upgrade
All in all I gave it 4 out of 5 stars. Mainly for the fact that it won't attach to all bike frames easily and can tip in Jogger mode if unattended with passengers (which i don't recommend anyway). Compared to the competition (which also have similar drawbacks) the Aosom 2-in-1 Double Bike Trailer is well worth the price, and has some great features and excellent build quality.