I have to disagree.
I have found my z.buds to be very useable and high quality. As a matter of fact, I listened to them for 4 hours today on the airplane ride down here to FL for a vacation and even after several months of ownership, they are great. Especially on the plane -- the sound blocking design really helped eliminate the plane noise and the screaming infant in the row in front of me.
And, two of the guys at work have the Zagg inivisbleShield skins and they are great. I doubt you could scratch the shield without physically damaging the underlying phone. The one complaint they both have with the shield is that the edges collect lint from your pocket, so you have to get used to seeing fluff stuck around the seams on the shield.
Anyway, my review of the buds is below, and as for the Shield products, there's just what I've said here. The 50% off deal is killer IMO if you want these kinds of shields.