I just finished assembling this gazebo last weekend. I agree with the other points people have said in these reviews. The 10hr assembly is definitely not realistic unless you have two people experienced with this particular gazebo. I'm 53yrs and it took me 22hrs.. Plus another 6hrs combined from another person who helped me the 1st day and 2 more for about an hour to get the roof panels in place.
Biggest advice... Pick the bilt app Or the written directions (they are slightly different) and follow it carefully! Once the roof panels are in place and secured by the 1st bolts it's easy to get ahead of yourself seeing what comes next and not look closely at directions.
I was missing one piece from one of the 10ft "A" frame pieces (which backyard discovery shipped me 2day express with no problem or hassle)
So we put up the other 3 roof panels and secured them. When we finally put 4th and final roof panel in to place I ended up having to loosen almost all the bolts to the other panels and nudge over panels to get all the holes to align... The manuals clearly say do not tighten until they are all in place and bolts started. So again.. It's easy to get ahead of yourself, don't skip something thinking you can come back to it, it's in that order for a reason.
Also.. Pay attention to when you have to drill pilot holes! The pieces come with probably 95% of the pilot holes already there for you, but then the instructions will say fasten such and such drilling a pilot hole.. And if you read over it quickly you can think the pilot hole is already there.. Happened to me and wood started to split so backed out thinking I was using wrong screw,... Looked at instructions more carefully, and was like oh... I was supposed to drill pilot hole.
Other than that it was pretty straight forward, a couple of the wooden roof cross pieces were warped making holes kind of a pain to align but nothing too bad.
I definitely recommend taking the 2-3 hrs before you start and unboxing everything and sorting it, put bags of screws /bolts and washers in numerical order so they're easy to find, and be careful tearing open the bags, don't destroy the markings on the bag identifying what part# they are.. Some washers you'll use a lot of.. Then come back to them hours later and need more of the same part #.
Raising the roof panels instead of putting a person on ladder in the middle we had person stand on ground, they used a 2x4 about 6 feet long as a pole to help guide peak of roof panel in place under roof cap, just had to remind them don't put 2x4 against sheet metal roof... Keep it on one of the cross wood frame pieces, it worked well.
Bolted all together and tightened down its a very strong structure. It should last a long time and withstand the changes in weather here in Wisconsin and occasional heavy snowfalls.