practical experience
hi Bill,
I have used them all three:
- standard hose as it comes in the box
- double length hose, same material
- stretch hose
here is what I have found:
The standard hose does a good overall job, yet it is a bit too short to my taste, you have to move around the Kirby too often.
The double length hose is exactly what I need most often, Kirby in the middle of the room, reaching all corners and above-the-head spaces with ease. Drawback: the turbo nozzle (aka zip brush as it is called in the US) has a noticeable drop of speed, yet ok, it works (you only hear the whining a bit lower than normal).
Stretch hose: it DOES contract from the suction, but the main pull comes from the spiral: as you pull, the Kirby will follow, esp. when the drive is in neutral.
For cars however it works really fine, as long as the hose has spots to wrap around or to cling to (seats, door seals, headrests etc.)
pull it as you can, having the Kirby close to the door opening and facing "inwards" (so it can't come following up any closer) - this will do fine all over the place for the upholstery nozzle, crevice tool and the like, but not so much with the zip brush (same drop of speed when in full length, but ok when short).
One thing to consider: the stretch hose does not appear as sturdy as the normal gray hose, the stretch hose has that typical "Dyson plastic gadget" feel to it - taking into account that the G4, 5, 6, 7 and Sentria hoses are not really THAT sturdy either, both (stretch and normal) are very much the same but both are NO comparison to the really good old Heritage hoses with double layers and their flexible, easy flowing "go" that they had.
Buy the stretch hose for your car if you can get a nice price that won't hurt too much. Or even though, you might resell it again if you don't like it. At least here it is rare enough to find, so might get buyers with ease.