I have a very similar-looking skin on my SLVR (NOT a Seidio product).
It is literally "paper thin" and adds nearly no weight or size to the phone, yet protects it from bumps and scrapes and gives it some grip. I'm hoping the Seidio Jet Black Skin (ordered and, apparently, shipped) is the same type.
After about a year of daily use, the skin has not stretched out in any way and still attracts very little dust... a quick blow (like blowing out Birthday candles) and any dust/lint is history. I take it off once in a great while and wash it with tap water, which seems to re-vitalize it.
The only issue I see is that the corners of the skin surface are slightly "rubbed" or "buffed" looking from normal wear.
Can't wait for the Seidio skin! (Though I do love the feel of my "naked" Pearl...)