Giottos has performed fine for me, even when removing of the screen. The key thing to remember when removing the screen is to do it carefully. The heat that you need to apply is only enough to get the adhesive soft, not heat to melt it. The amount of heat applied should not prevent you from putting your fingers on the glass if you burn yourself then you put too much heat. Really, all you need to do is warm it up to soften the adhesive.
First off, I am very good with my hands and I am very patient, if you aren't, then do not attempt to do this.
Items to remove the old Giotto screen:
Hair dryer, sharp wooden toothpick or a plastic knife, Qtip cotton swab, rubbing alcohol and most important, patience. NEVER USE DENATURED ALCOHOL!
Step 1: Place the camera on a nice sturdy flat surface with the screen facing you. Apply heat from the hair dryer at the most for 10 seconds, just to heat up the screen and not too much to melt the screen. Check the adhesive with the toothpick along the edge, the screen should move slightly as the adhesive softens. If no movement then heat a little more, stopping often to check on the state of the adhesive. The adhesive will not release 100% by heat alone and thinking that will damage the underlying LCD cover!
Step 2: With the adhesive softened, you should be able to just lift a corner of the screen. The adhesive has not given up the hold mind you and by just lifting up is about .001 of an inch so be patient or you will crack the screen and may scratch the LCD screen that you were trying to protect. Dip the Qtip cotton swab in some rubbing alcohol. While prying the corner of the screen, touch the Qtip to the edge, let the capillary action draw some alcohol into the adhesive. Do not soak the screen just a minute amount on the raised corner adhesive is all that is needed. This will soften the adhesive and make it easy to remove. Be patient, the alcohol will slowly soften the adhesive.
Step 3: Be patient, take the toothpick and try to raise the screen off the LCD, as the adhesive is still holding fast, you will gain a bit more movement. Once again, dip the Qtip cotton swab in alcohol and touch the upraised edge and once again let the capillary action do it's thing. As the amount of adhesion decreases, you can go around the border of the screen just touching the edge, wetting it ever so slightly. Be patient, the previous steps have allowed you to breach the seal of the adhesive and the alcohol will break down the adhesive.
Step 4: Go around the border of the screen with the toothpick and gently pry the screen off of the LCD. Avoid putting too much pressure as this will crack the glass. If one area is stubborn, get a second toothpick to hold up the screen as a spacer and apply a little more alcohol to that area. Be patient and let it do it's job.
Keys to success is patience, do not use too much heat, just enough to get some movement and never use denatured alcohol. Too much of a good thing is bad, too much heat and you will possibly damage the LCD. Too much alcohol and the camera will drown. Use common sense, if you do not feel comfortable doing this, have a repair person do it. Use only rubbing alcohol, denatured alcohol is a solvent that will damage your camera.