Caution: The details currently listed on this product showing that it has a lifetime warranty is incorrect.
If you dig through the 20 tabs of warranty information on the Zagg website you eventually find this little detail
"What products are covered under the Lifetime Replacement Guarantee?All invisibleSHIELD types excluding ZAGG Privacy and the Universal Screen Protector." When you contact customer support they argue that the 3pk should more than give you enough shields to work with. (The one I ordered was a FFUNIPRO2PK so it only contained 2 but that made no difference.)
Incidentally the warranty for all Invisible shields doesn't cover errors in installation like bubbles or misalignment (either of these cause the shield to fail) or any potential alteration to the shield. So if you misalign it, you void the warranty, if you try to trim a sliver off so it will not keep catching on things and peeling off, you void the warranty. So apparently it is warranted against dremel tools, keys, bolts and other things they snow in the video but not people trying their hardest to make the shield work on their phone.
In truth though, if you can get the shield to go on perfectly, the thing is perfect. I have one that BestBuy installed on my HTC Innspire 2 yrs ago and it still looks like brand new. However the two different attempts to put the universal on my wife's Samsung Reverb failed within three months.
If you don't have a case that covers the edges of the shield, it will fail as dirt and debris gets caught under it. Once that starts, the thing is doomed.
My advice, if you need the universal, save your money and buy a more affordable product that offers similar protection. The high price on Zagg invisible shields primarily for the "good" warranty is completely wasted on this product.
BestBuy, please update the details of this product to reflect that it does not have a lifetime warranty.