I purchased this 17 months ago. However, due to bad weather conditions, I was not able to get it assembled and in place until last fall, thus it has now been installed for a period of 8 months - through the winter, a very warm but wet winter/spring.
Overall, I was very pleased with the quality, especially since it is somewhat more costly than competitor's models. I loved the fasteners provided. Overall the markings on the boards was good although I did have a couple of problems with the wrong board being shipped. In one case, I trimmed the edge off a couple of boards that were too wide; in another case, the board was too short and I had to have the company ship me another board, which they did promptly.
I did pre-coat each board (as recommended by the manufacturer) with a semi-transparent exterior coating, dipping the end of each board into the paint bucket to ensure a good coating on the ends. Of course this was quite time consuming but worth it in the long run as the coating supplied by the manufacturer is merely a stain and not a weather-resistant coating. I have seen the same product nearby that the customer did not coat and within a year it is beginning to look quite weathered while mine looks as pristine as the day I put it together.
I did bury an 8 x 12 x 4 concrete block under each significant ground contact point, making sure they were solid and level. I then added my own turnbuckles and eyebolts to ensure the set did not move or "jump." Also, we purposely left off one roof panel (next to the crow's nest) to provide more light to the playhouse. In addition, I placed a kids picnic table in the lower floor area in that the manufacturer's design of the picnic table blocks off the access to the floor area except to climb over the wall or go through the sandbox.
The only aggravating issue I had with the entire experience were the drawings in the instruction book used to assemble the swing set. I called the company about this and provided written documentation to them regarding the issue. They said they were glad I called as well as provided pictures and written descriptions - by part number, but I can't say for sure they ever made any corrections to the instruction book. Overall, the instructions were detailed and properly progressive. The biggest problem, in addition to a couple of times where the instructions were in actual error, was that the graphic renderings were confusing. I am sure they looked really good on a CAD screen but when they were printed, hidden lines disappeared making it look like a part that was behind another part look like it is in front of the part, causing me numerous times to assemble a subassembly only to have to take it apart and reassemble it in the opposite location - no easy task given the hardware provided. I found that if I consulted the next step or two in the process, the rendering there actually often provided a truer picture of the prior subassembly than the one supposedly depicting the subassembly. I doubt the company fixed this even though I brought it up to them more than once. So, watch your step and don't get in a hurry or think you understand how a subassembly goes together until you check ahead in the book.