First one is difficult to assemble. But, once you get the hang of it, assembly goes quickly. The chairs are well made, sturdy but comfortable too.Pros: These chairs are very, very sturdy, and while only 30.3 lbs each, the bulkiness makes them feel a lot heavier. And you also get that sense when trying to move them. Probably the most well-built product I’ve purchased from Amazon to date (coming from China). Highly recommended, and I would definitely buy them again.Con: Three of the allen screws where the armrest bolts to the “rattan” back were too close to the underside of the armrest itself to be able to snap the plastic screws cover on. I’m sure I’ll do a little shaving to make them fit. But that’s about all I could think of, and even this was on the picky side.Update: Easy fix for the plastic allen screw covers: I used P320-grit sandpaper to flatten the buttons. It literally took only about 20 seconds each of rubbing them across the sandpaper. Way better than cutting with an exacto blade.About the assembly, I read where some had great difficulty putting them together, saying that this is really a two-person job. I have joint, tendon and lower back issues, and I had no difficulty whatsoever. But I had to follow a specific order. Once the “rattan” back was connected to the metal seat frame (that’s the only time I had to use the provided allen wrench—I used an allen bit on my cordless drill for the rest of the assembly), I started by screwing the allen screw through the appropriate arm and into the side of the “rattan” back, but not tightening all the way. At that point, it was easy to simply swing the metal seat frame up and attach it to the metal support frame of the arm. Same for the other side. It really wasn’t a difficult job—but the pieces are each very heavy and sturdy. And with it being on sale, it was a no-brainer! Great job, Grand Patio!Hints for a solo assembler:Unless you have extremely strong grip and upper body strength , you may want to read this review. I could not have assembled these chairs without either another person or a few pieces of extra equipment. A small plant table measuring 16 x 16 and 17 inches tall was a perfect workstation allowing me to sit while doing most of the work, giving me better leverage. Because the chair has a bit of spring to it, the outer runners/arms do not just set into place. You have to pull against the strength of the metal runners to line up the bolt holes. That tension is what gives the chair it’s spring once completed. However, the problem is that I am not strong enough to both hold it in place, balance it, and screw in the bolts. A 4 inch C -clamp was perfect to solve this dilemma. I also found that a ratchet-handle with Allen wrench bit worked well to save wear & tear on my hands. The small Allen wrench that comes with the assembly works fine but after while my hands gets sore using it. In addition, I used a little WD-40 on all the inner-frame nuts as some of them were slightly rough when inserting the bolts. Before assembling, I made sure to put all the bolts in place insuring they would screw in and out straight and easily. Lastly, a small modification was needed for two of the bolt caps. The bolts under the arms were flush up against the frame, leaving no space for the thickness of the plastic cap to slide in to place. Therefore with a pair of kitchen scissors I trimmed off a small section of the caps, allowing them to slide easily into place. I would venture to guess that the caps I had to trim may eventually fall off. But they work for now.Not one to give reviews but as a long, long time Amazonian felt compelled on this purchase. These are really super little spring chairs, they surprised both my wife and I in terms of bang for the buck. She put the first one together in about an hour all the while putzing about the house doing other things. The second one was a different story. I looked at it and noticed the holes were drilled in the wrong places. It simply defied assembly under those conditions. Please see photos for an illustration of the problem. These would have been 5 star chairs in every other respect!these chairs are solid . they were also easy to assemble and are very comfoartable.I bought these chair for my balcony and I love them. Highly recommended.Another tool you will need is sturdy scissors or something stonger than a box cutter to remove the heavy duty zip ties. We assembled part B by first attaching the leg/arms to the seat then the arm to the back. The arm to the back is dificult and requires another person or a clamp as another revier put. The screw head is so large that it rubbed against the arm metal and would cross thread the screw then the cap will not fit on as there is not enough room. There should be a seperate screw with a smaller head than the H screw for this connection. We also found it easier to attach this portion before putting in the C cross bar. After that everything is easy, they are heavy, solid comfortable chairs.I ordered two of these chairs for my son’s apartment patio. He’s on the 4 th floor so needed something heavy! These chair fit the bill! I read the reviews that said they were hard to put together! Disregard those! I’m a 66 yr old woman and I put them together by myself! No problem! I was careful to get the screws tight but not tight enough to strip them! They are comfortable to sit in! He loved them!!! I would recommend them 100%!