Just to share a few comments:
I have been using an SL-X for just over a year, probably gets, conservatively, about 25 hours use a week. I don't use it for ground floor, I find it too heavy.
I don't look after it like it's my pet or something, it is a costly and valuable tool.
I haven't cleaned it as regularly as I should, so that gets Alex off any warranty issues. In fact, although the hose gets a wipe down every couple of days, I have taken the pole apart to clean and maintain about 3 times.
I left it so long this last time that some of the sections were almost seizing up - stuck with grit and carbon dust. The clamps had worked a bit loose so the sections were slipping and turning.
Interestingly I have discovered (mine's a mk 1) the section circumferences are not consistent, ie. tight in some parts loose in others, nothing to do with wear and tear.
So last weekend it got some TLC. I took the whole thing apart, tied a bottle brush to a long stick and cleaned the sections internally - (flushing with water not sufficient), wiped down the sections externally, scrubbed the hose and reassembled.
I had to reset all the clamps, one of which is slightly loose on it's own section.
Then the vital final touch... A few drops of Loktite.
Got the pole out to use yesterday....I couldn't open the clamps at all! It took me about 20 minutes and I nearly snapped them! They had all firmly seized up with Loktite! Instead of a couple of drops per clamp I had used about 10 per clamp. You can be too thorough!

Anyway, it's still a very good tool, the best of it's kind all round. Bit of a nuisance to maintain, but I wouldn't swap it, there's nothing better, as far as I have seen.