We installed an 11 station continuous tee from Fiberbuilt about 4 years ago. We have had to do ZERO maintenance to them since being installed. Poured concrete and assembled the mats. Took us about two hours to put together. What I liked about this system, and the reason we went with it, is that it is totally modular. If a section gets damaged or worn out, you only replace that section. But after four years we have had to do nothing to any of it and it is still holding up strong. It's a bit more pricey than the competitors mats, but I am confident that this system will hold up for 15-20 years.
We used to have some cheaper individual 48" x 48" mats. They didn't hold up very well and after five years they needed to be replaced. Actually really after three years but we didn't have the money to do it. Since we've installed the Fiberbuilt system, out revenue has increased and the members really like it much, much more.
http://www.fiberbuilt.com/golf/tee-line/