Last year I wrote about the Invisible Shield screen protector for my original iPhone. As many point out the iPhone, iPod touch and new iPhone 3G’s hardened glass surface is scratch resistant.

But it’s not smear resistant, and that’s the real reason I dig the Invisible Shield. So I was thrilled when the company sent me the updated version, which fixes something that irked me about the first one: The open circle around the Home button.

The new one closes the circle for a nicer finish – and also introduces two new flaps at the top and bottom of the shield that totally buzz-killed my first and second attempts to achieve the kind of perfect fit I attained with the original.

The flaps overlap the top and bottom metal edges, with little spurs on either side to allow for the device’s curvature. Unfortunately I couldn’t get the top or bottom flaps to completely seal, and blister/bubbles appeared in both tries.

Frankly I don’t see the point of the flaps in the first place, and when another set arrived I trimmed off the flaps and spurs with a sharp chef’s knife, which allowed me to achieve a nearly perfect fit.

I say nearly because I didn’t quite trim enough from the top flap and some of it extended beyond the glass. I trimmed most of it off without removing the shield, and I’m happy with the final result.

As mentioned in my original review, the Invisible Shield gives the screen a “watery”-like finish that I personally prefer to pure glass, and the fact that I don’t see smears will have me recommend it – though I also recommend you trim those pesky flaps and spurs so you achieve a perfect fit the first time around.