I am unfamiliar with the Invisible Shields but I have previously purchased the Hoodman Hoodskins and was quite disappointed. They are easy to apply but even easier to peel up at the edges and come off.
I put one of the cellphone I bought two weeks ago. I will leave it on as it must protect the screen but it really picks up smudges - I am constantly wiping it. Not too bad for a phone, but it would make the lcd harder to read.
However, it is worth trying - I would be curious if you keep in on after a few weeks.
I use the Giotto glass protector. Little pricey but I have had the on my past camera's also and held up great and when I sold the camera's, the screen was perfect.
Grace,
I've been using Zagg Invisible Shields on all my phones & cameras for a few years now. The shields are pretty much indistructable. And they even seem to self-heal. The resulting surface is slightly ripply, but it is not an annoyance.
I've had other shields on the camera viewscreen & found that a scratch could easily penetrate the shield & scratch the glass underneath.