I used to think that Unger poles were the 'poor man's pole', but they're top notch.
I've five sections on mine and can reach to four-stories (although have only used them on three-story work).
The beauty of them is, you only use the sections you need, so for normal houses, just the first two sections are great, and much lighter than an 18 foot fibre-glass pole.
For ground floor work, the inner section is magic. Extremely light; weighs nothing.
And each part is replaceable individually; including the pole sections; so there's a saving too. Just buy the worn parts, rather than a new pole.