I recently bought myself a new screen protector and mounted it today. It's a 3M Vikuiti DQCM30 foil, that's the matte (or anti-reflective) version. It says that it should fit especially for the I9023, but as the protector I used before it seems more that it was designed for the I9020 as it is a bit to short on the upper and lower edges. But as these zones are not used at all, I don't really care.
The display itself is not really affected from the protector, everything still looks very sharp and could be well read. The only situation where you realize the protector is when you look at a big, white space on the screen. Then you see some kind of little pixels, but that is the typically look of anti-reflective protectors as far as I know.
Using the phone feels very well, the protector itself is very plain on the surface so your finger can easily be slipped over the screen.
Overall I am satisfied with the new protector, but after all it is a personal preference whether you like clear or matte protectors.