I bought two wrapsols for two different 13" MBA's and one fits perfectly but the the other overhangs by 1/2 mm. The material stretches so if you squegee too hard it may end up being too big, but I didn't stretch it all that much and yet the lid section of my second one appears to be larger than my first one. I'd rather have it be a bit short than too long. Debating on whether to request a replacement from wrapsol or just live with it.
It happens some time and from my experience, if you complain to them that a certain piece is too long and it overhangs, next time if you get a replacement it will be made a bit smaller or shorter.
Material wise, Wrapsol is great and trust me, this adhesive is very workable and forgiving. The fact that it can be stretched a bit
right after you squeegee down the solution out of the film helps a lot on working on the gadgets as you cannot have too much water/solution at the edges. In order to stretch it while the solution was squeegeed out, the film must not be totally dry or you will damage the adhesive, leaving some marks..
I am totally satisfied with the Wrapsol product. Another poster was right, you have to be quite meticulous and perfectionist to achieve the best result, just like any films on the market.
One good advice is it is better to perform the installation under sufficient lighting so that you can see where the edges go. You have to check constantly at all the boundaries to see if repositioniong of the film is necessary.