I had saddle bag type panniers from Jandd which i liked but they were small and it took a little work to get them secured on my rack and detach. Next, I bought a set from Performance that were very servicable for the cheap price I paid for them. Decent construction, not waterproof and somewhat difficult to attach. I now have a full set of Ortliebs, back and front that I use for touring. They are nice, easy to attach, expensive, but have no outside pockets.

I am sure the Nashbar ones you are planning on buying approximate my Performance. I was perfectly content with these but eventually the upgrade bug got to me and I bought expensive Ortliebs. If you are immune to the upgrade bug then go with the Nashbars. Otherwise, if you think you are going to eventually upgrade you might purchase the better ones and skip the expense of the cheaper ones.