GALLEGOS pneumatic trailer

Im just wondering about the Gallegos pneumatic trailer and it's durability. All trailers have weaknesses and flaws that show up in time. Example Stevenson's crack on the passenger side where the front 2 pods meet; outer top. Most don't leak and are repaired before they actually do leak.
I'd like to hear from actual experience's if possible.
Are they slow to unload? And maybe something's you don't like or especially like?

Thank you.