Got the SL-X in the end.  Used it solid for a couple of days, fully extended at awkward angles and so on.  It works like a dream.  Today I used my 28ft hybrid xtel for the backs of 2 places that just needed that extra length, now I thought that the hybrid was a good pole (which it is), but after 2 days with the SL-X it was like wresting with a 28ft snake.  The SL-X makes doing the second floor up as easy as doing the ground floor, it's just so stiff.
Am I preaching to the converted?!?
Simon.