Just to add that any building is as good as the contractor that installs it. I have seen fabric covered buildings that are commonly referred to as the brand name “Cover-all” that are cheap copies. Inferior material, inferior installations. Then when people compare an inexpensive copy structure to the real deal they think they are all the same. They are not.
Our “Cover-all” had full steel sides and wood framing exactly as a traditional riding arena would be built. The bright Lexan windows ran the entire end and we had a patio deck and sliding doors installed in the viewing platform. There was always a cross breeze in our arena and not once in 7 years did I ever notice one drop of condensation. Ever. Our arena was not attached to our barn however and I suspect for those that are attached the humidity is probably coming from the barn not the building sweating itself.
Cover-All (the company) went bankrupt that is true. However Norseman Structures purchased the assets from Cover All in 2010 and honoured all the existing Cover-all warranties. There was no change from before. The new buildings match the old ones exactly. All parts are interchangeable including the fabric covers if needed.
We found that our arena was normally 10C warmer in the winter and at least that much cooler in the summer. Lovely riding environment.
The good fabric covered structures can be the same price or even a little more than a traditional steel and wood structure however. Anyone that says these are cheap and inexpensive structures is incorrect. Nor are they very portable (tornados notwithstanding). They are quite permanent.