The trailers arent bad.
My 4x8 trailer is very similar to one (might even be one) and its pretty good. I paid $200 for it used and spent about that much on new wheels and tires and wood for the deck, sides and gate and paint.
It hauls my quad with no problems at all.
To me the trailers at Home Depot/Lowes/Tractor Supply are a bit pricy and the decks dont seem all that sturdy, atleast not the ones with the holes in them (fence looking type).