I have had my Go Trailer for about a year, and have zero complaints. It is fast, and easy to use. With the go trailer, the slowest thing about my camping trips is putting away sleeping bags and letting the air out of air mattress's. The one thing I would like, are some sides for the trailer. I will likely build my own at some point, but it would be cool if Sylvan Sport would make some adjustable plastic sides with strap hooks and such (including a back).
Our GO! is wonderful. We are downsizing from a full size pop up now that the kid is headed off for college. This gives us the off-the-ground camping experience we enjoy in a pop up, but without all the extra weight. Plenty of room for 2 on the inside. Lots of space under the fly for a picnic table. Easy enough for one of us to maneuver it onto the trailer hitch. More than enough space to store our supplies in rubbermaid totes in the space underneath the tent while traveling. We can even fit it in our 2 car garage - with 2 cars in the garage. We've only used it with two of us so far, but my husband plans to take a couple of weekend fishing trips on his own this fall. Probably our best camping related purchase ever.