I do. I have the 16 footer. It's a beast. The advantages are that, with the tall wood sides I built, I can load even more "light material" debris on haul away jobs (landscape tear-outs and such). Similarly when hauling straw bales I can get another row of straw stacked at the higher levels from the extra width.
Also, in the jobs where I haul my Track Loader with this trailer instead of my equipment trailer, I can maneuver my body around in the trailer better when loading and unloading.
It's a nice trailer, I don't see any disadvantages to it besides the slight extra cost.