I ran RTPs on my 26er for a bit over two years. About a month ago, after something like 3000 miles or so I had to give up on the rear tire. It was becoming flat-prone. The center section was worn smooth but just barely so about half the tread was gone.
The front RTP tire is still in use and has never flatted in that time. I have a Continental Contact Speed 26x2.0 on the back wheel now. Trying that out to see if it is a reasonable choice for the rear wheel. I may stick with RTP in front for a while.
Otto