I have two kayaks and two solo canoes, which I keep in a public storage unit, so the two racks were just what I needed to get my boats off the floor and free up more space.
My nephew, who is very handy with tools, put them together for me---it took about 15 minutes for each one. The instructions were logical and the hardware and tools were there; I could have done it, but it would have taken me a lot longer by myself.
The kayaks go on the bottom of each rack, and the lighter weight canoes go on the top. My larger canoe is 13 ft long and 29 inches wide and it just does fit on the top rack---any wider and there would have been a problem. The kayaks (Hurricane Skimmer 128 and Swifty 9.5) fit easily on the bottom.
It is just a personal preference, but since I often have to boat up the evening before a paddle to get an early start, and since I live in Florida, it would have been better for me to have a removal seat that wouldn't get rained on during the night. The seat itself is very comfortable and adjustable, and I don't doubt I'm in the minority about that feature.
Other SOTs that I have paddled (Tarpon 100, Hurricane Phoenix 120, Perception Tribe 9.5 and Perception Tribe 11.5) don't come close to the performance and beauty of this boat.