I just received my Seidio Ultimate Screen Guard for the Motorola Droid recently and was really excited to see how it compares with other screen protectors. I've used the Zagg screen protectors before and hate the soft feel and the orange peel effect.
The screen protector comes in a plastic sleeve with an instruction card and is mounted on a thick piece of plastic. It was nice of Seidio to put the screen protector on a piece of plastic that was bigger than the screen protector because with many other brands it is difficult to figure out which piece is the screen protector. Following the instructions I was able to put on the screen protector in 10 seconds without the use of a credit card. I had a few tiny air bubble but I was able to get them out by rubbing the screen with a cloth. The screen protector covers the entire screen including the buttons on the bottom and sensors on top. I did notice that the screen protector was slightly short from covering the entire screen which caused the ear piece hole to be slightly off. It is impossible to tell that the screen protector is on unless you look closely at the edges. Although it is not stated to be fingerprint resistant, I found it harder to get fingerprints and smudges on it compared to a naked screen. I tried sending some text messages, surfing the web, and making phone calls with the screen protector and completely forgot I had it on there. There was no interference with touch screen or the sensors.
For those with the Seidio Innocase, I was able to put my case on with any problems from the screen protector. The top piece stayed on even with me trying to push it off.
I would definitely recommend this screen protector to anyone looking to get one. It is the best quality screen protector I've ever used and the easiest to apply.