These are really a great idea! They are VERY sturdy as well! I bought 3 of them for a pergola. The only reason that I did NOT give it 5 stars was because of the "instructions" to assemble. They were very vague. The "Lock Nuts" were called "washer nuts" and in my opinion ALL of the nuts should be LOCK nuts. I feel that we may need to constantly tighten the nuts on these swings for safety. (The 4-locknuts are used on the seat where the chain connects.)  Also, the screws require a special tip that is not included, so either have other screws available or find the square-bit tip for theses screws. We did have a couple of parts that needed "manipulation" but once put together, it all seems fine. All-in-all, we REALLY like these! You can actually have two people facing different directions while swinging. In a pergola or open-sided gazebo, these are the PERFECT swing, and with 1000 lbs weight load, and large seat area, you don't have to worry about guests breaking them!