I started off with the IS film from ZAGG, but made a mess of it immediately. It's too sensitive to fingerprints on the sticky side while applying it, and if you don't get it just right the first time you really can't start over. The film will stretch slightly if you pull it off to reposition it, and where it stretches the optical qualities will suffer.

Next I applied the Vikuiti ARMR200. This was pretty easy to apply. It's a comparatively rigid substance, so if you hold it by the edges and flex it a little it won't flop all over the place and stick to everything in sight, like the Invisible Shield does. Also you don't need to mess around with spraying your finger tips and the protection film.

I used this for a few weeks , and was very impressed with the "finger feel" and stylus sensitivity. It really does impart a papery texture to the touch screen, but some may not like this.

In the end I removed it because the texture will slowly cause finger oils to build up where you use it the most (right in the middle) and no amount of wiping removes them. The screen always looks dirty, when turned off, although I admit when in use this really isn't an issue. The anti reflection properties are great.

Now I'm using the Vikuiti DQC-160. This is super shiny and slippery, and wipes clean very easily. The touchscreen is slightly less sensitive with this on it than with the ARMR200, which excels in this regard.

As others have noted, it is very hard to adhere the Vikuiti product around the very edges of the screen. I have several narrow areas around the edges which simply will not stick.

I think the bezel around the screen holds oils from your face, and it is difficult to clean out this area, so if you have been using the N900 for any amount of time before you apply the Vikuiti the oils will leach out a little and interfere with good adhesion.

So in the end I have spent about $30 mucking around with various screen protectors, but I definitely can recommend the Vikuiti DQC-160.