Why anyone would want a modular pole for Domestics is way beyond me, even if they are quick, you'd spend a lot more time on it.
And it might be light, but is it strong enough?
SL-X all the way. 
mine is a few weeks away from 1 year old, 1 year for 21 quid, its not about the money either, ive got a few bob i would like to spend on my biz, ive got a nice van now, im looking at a custom tank and a hose reel, ive thought on what else to buy, i honestly for domestic work ( and ive got some 3 storey commercial ) i couldnt use the SLX, its too heavy, once you have tried the lightness of the Z-flex, your spoilt
as for the quickness, mine is in 3 parts with the brush pole about 3 ft, ideal for downstairs windows, this pole does every1 of my domestic houses apart from 2 windows ( that i can really stretch for, but its hard work ) so i now have a 4ft bit that goes on the base, this gives me that little extra that i need
ive tried the SLX and its heavy compared to the zensorflex, the difference is massive, whilst the SLX looks nice ( dont forget the way the sun catches it ) and its a telepole, the Z-flex is just so light