Since you bumped . . .
I don't have any experience with the QuickRack. Instead I have the Old Man Mountain "Sherpa" rack on my Jetstream XP. Works great, looks cool, and I can raise and lower the seat with no additional monkey business.
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I came to say I must be folding . . .
Dahon Jetstream XP
Dahon Helios SL
Strida 5.0
Twenty project
— or not . . .
Fisher Mt. Tam (c.1988)
Merlin Road flat bar project
Schwinn Twinn Deluxe