I have used Zagg Invisible Shield for at least 3 or 4 of my laptops + iphones. I have gotten quite good in putting them on. But I do prefer the non-glossy look of Wrapsol. Just installed in on my 11" MBA. I must say, the matte, yet sparkly look is much better than the glossy invisible shield. Installation was also much easier because the matte finish hides any imperfection (like bubbles). For invisible shield, the tiny pockets of water will take days to weeks to complete vanish. With wrapsol, I don't see them at all ever right after installation. Finally, the cut or fitting of my wrapsol was perfectly fine. It's between 0-1 mm away from the edge all around. The key is not to over stretch the film, but gently wipe to squeeze the water out while stretch gently to bring the film's edge to the computer's edge.
EDIT: I did find something I don't like. The wrapsol film covers all the screws in the bottom of my MBA. If I ever need to open it up, I'll have to remove and discard it. The Zagg invisible shield I had on my 13" MBP had holes around all the screws. I opened/closed the MBP a couple of time to upgrade the RAM and HDD. I won't be able to do similar upgrades for the MBA, but still be nice to know I could when I need to.