I bought the official HTC protectors from Play.com a while ago. There's 2 things I don't like about them: -
1. There's a hole in the protector for the LED, but the protector doesn't stick down very well around the hole, so it's noticeable.
2. There's a small rectangle cut out of the protector on the upper left side. I have no idea why, but again, the protector doesn't stick down fully around this area.
If it wasn't for those 2 things, I'd give them 5/5, but only at the 5 quid price Play are selling them at. The retail price is ridiculous. I managed to apply one without getting a single speck of dust between the protector and the screen, and it doesn't seem to affect the responsiveness of the screen at all. The very slight noticeable areas around the cut outs mentioned above are the only negatives. Without those, I don't think you'd even know a screen protector was fitted.