Nothing at all wrong with using front panniers on the back. I prefer the Packers to the Rollers, but my commuting panners are a set of Ortlieb fronts.
Mine have been flawless for four or five years now. The only issue is that at the time the only fabric you could get in yellow was the Plus fabric. It's textured on the outside and hard to clean. Stick with the regular fabric.
While I suspect they may not be the same quality, these seem a bit like the Nashbar waterproof, in terms of style. What is it you like about these over the Rollers?
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A conclusion is the place where you got tired of thinking. - S. Wright
Favorite rides in the stable: Indy Fab CJ Ti - Colnago MXL - S-Works Roubaix - Habanero Team Issue - Jamis Eclipse carbon/831