I've got the little 40 x 49 model. There's not much to dislike about it.
Assembly is required, I added 18" to the tongue so I could add an ice chest, relubing the wheel bearings with quality grease is a must on assembly, those chinese folks used what resembled Vaseline. I also removed all but one leaf spring, to soften the ride... I never load heavy when pulling with a bike anyway.
The small 8" tires are a drawback for some, but I never had a problem. Only ran 20psi to make it ride smoother.
For the $, they can't be beat, IMO.
I just the other day, purchased one of the Tag-along trailers for use with the trike. It appears to be the same quality, tho I have yet to assemble it, or add my paint & lights.