We built the pool with Sylvan over 40 years ago. Then, we had the interior remodeled with them as well. We had a fine experience with the design consultant. Came out and measured everything, told us what to expect, how long it would take, what substance they use and when it would be done. The team that scheduled and coordinated our renovation was Spanish-speaking and I do not speak Spanish but if I had a question there was one gentleman I could speak with. This is the second summer now since it was done and it looks nice and is smooth. Nice clear water and we've had no problems with it.