Well, my Xtreme 22 mentioned at the start of this thread is still going strong. Not had to replace any sections yet. There are clear signs of wear on sections 1 & 2 but they still look and feel pretty sturdy, and slight signs on the other sections, but when I consider the amount of work I've done with it and what it's earned me, I'm well happy.
As far as maintenance is concerned, I've probably taken it apart, cleaned and retaped seven or eight times in all. I've also lubed it several times with Gardiners dry film lubricant.
Overall, I absolutely love this pole and will definitely buy another when this one is done.