WE HAVE 3 and very happy with ours.
i also have slx poles and really isnt a lot in it on shorter poles.
i have the flipfast and aquadaptors (mk3) on them, and think they are perfect, the 9/10" flipfast is great for awkward angles and brill for sills.
At heights and really awkward angles the slx is superior, everday cleaning 3 storey and below the elite is fine.
SPK TO PAUL AT AQUADAPTOR, HE GAVE ME AN ELITE 25 FOR SAME PRICE AS AN 18 I THINK IT WAS.