I have those exact d'addario flats on a small body acoustic and I love them! They are very mellow sounding right out of the package, but I wouldn't say "dead" sounding. They are definitely a distinct sound, maybe not good for everyone or everything. There is definitely no squeak, and they are extremely comfortable to play. Everyone that has played that guitar has complimented the sound, so that's something. I say go for it, worst case scenario you hate them and you're out a couple bucks. One thing to note: they do not bend, or rather if you try to bend them what little they do bend sounds pretty terrible. They're definitely intended for strumming or fingerpicking, not lead work.