I add my vote of confidence for the 5-rail Pass and Stow. I had mine for several years on a Pugsley, carrying my winter commuting and shopping loads in a Porcelain Rocket x Monkey Wrench Cycles bag. The dynamo wiring accommodation is outstanding. Though useful, I found the setup on the Pugsley a bit cumbersome for anything but transport hauling.
I recently moved the rack to an Albatross'd 1993 Trek 950. Quite unlike on the Pugsley, the Trek handles beautifully with the rack. Unloaded or minimally loaded, I can ride no-handed as if the rack weren't there. A heavy grocery load slows the steering down considerably, but not unpleasantly.
I should add that, when I decided to move the rack from the Pugs to the Trek, Matt didn't have sets of spare legs listed on the Pass and Stow website. I e-mailed to inquire about purchasing the correct legs, and he got right back to me. I had the set of legs a couple weeks later. He also included a complete set of fresh hardware. Installation was a breeze.
If I had not sold my AHH several years ago to fund a custom, I think I would have a silver 5-rail rack on it now.
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Bob