I would never, never, never use any "generic" (IOW - low performance) brake pads from an auto parts store on my NSX. The NSX has formidable capabilities and I wouldn't want to degrade its performance by using something that's less capable than the stock parts - especially on the braking system.
Furthermore, this is a real possibility, since the size and shape of the NSX brake pads are identical with certain Legend models, so auto parts stores will probably carry inferior brake pads that will fit the NSX. Even Acura sells cheaper, lower-performance OEM brake pads for the Legend that are different from the OEM pads for the NSX.
Using such pads is a bad, bad idea.
$.02