Well, the paint doesn't match the pearl white covering, for one, and you have to glue the canopy in from the inside, which is not only Cumbersome, but it is something that you did not have to do at all with the EF or the QQ, and the paint match was spot-on.
Also, I haven't taken the time to read the entire QQ yak forum, but I think the EF was the lightest...mine came in at 15 pounds, even. The only thing I didn;t use in the kit was the wheelpants.