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2.5 years ago, I heard that dirt/stuffs could get through the gaps between the case and the laptop to cause scratchings of the MBP. Has this problem been fixed?
I strongly feel so. The last SeeThru I had never gave me such problems to begin with. Anyways, the new one with the new MBP is a very accurate fit. The computer doesn't "rattle around" inside the case.
I had (still have) a see-thru/clear Speck hard case on a 2006 Macbook. Yes, that one lets crap get in between the case and the computer and it's caused abrasions that have scratched the old non-Unibody casing. I hate that thing...the lid is also way topheavy so when you pick it up the Speck weight causes the lid to flop closed more often than not.
Then again, that particular machine is kept in a dusty/dirty environment....a woodshop actually. I use it for design purposes for some of the work I do. It does get put away in a dustproof container when the shavings start flying, but it is often open on my workbench prior to/after actual work.
The new Satin case does have a tiny bit of give. First off you've got holes in the bottom of the case, but also if you look VERY closely (almost need a magnifying lens actually) on the fit along the bottom part of the Satin case back by the hinge lid, you'll see a slight pucker. It's not an airtight seal, it wasn't meant to be. So sure, I bet crap can get in there also with heavy use....even lint from your backpack or whatever.
That said, if you want an airtight seal that is assured to NEVER let something get between the case and the body of the laptop, you'll likely need to use InvisiShield or something similar. That or get your buddy at the monster truck store to apply truck bedliner coating to it.
Just take the cover off every once in awhile and clean the insides. No big deal.