I've just bought a black 3GS and am looking to purchase a slim case for it. I really like the look of the SGP cases, but have read mixed reviews on the build quality. Are they likely to fall apart? I am interested in the UltraThin Black, UltraThin Carbon and UltraThin HiGloss. My other question, besides build quality, is will these catch on the inside of my pockets? I have used cases on other assorted Apple products in the past and generally did not like them due to catching corners or rubber surfaces! If the SGP cases are not up to par, are there any other similar suitable cases about?