I was a little concerned with all the comments about the Zagg Invisible Shield and a tad concerned when it turned up without the usual spray bottle. Zagg have changed to using a sponge in a plastic bath affair. I wasn't impressed at first but I must admit it makes a lot more sense and made things much easier to apply.
The spray bottle in previous versions created bubbles on the film which were hard to remove. Using a sponge means simple wiping the film over the moisten then slide into place. They even provide a microfibre cloth the give the phone a good polish first. The card provided to smooth bubbles out works fine though for the back I suggest using a finger hard over the 'Nokia' wording to get it into the letters.
As with all Zagg shileds, leave the very edges on bends to dry off for a minute before bending down and you'll find the resul better. Hold the best over piece in place for a few seconds and it will take properly then.
I cannot stress the importance of a dust-free environment when applying the shield. Any dust in the area will magically stick the piece that covers the screen then take ages to wipe off. The sponge wiped over the film helps here btw.
End result is a shint back and edges that is less likely to slip. The screen is slighty less slippy when use but fine if you use a finger and style is only marginally different. A very slight addition to the pressure is required but I was pushing hard enough without the screen so no difference to me really. Screen a tad shiny so sunshine might affect it.