I like the DESIGN of Glock sights (the white-outline rear and dot front) but have heard a lot of complaints relating to the fact that they are plastic (I've even heard of a few cases where the front sight fell off). Since Trijicons are high-quality steel sights, they should be "better" than the original Glock plastic sights.
Just avoid the Glock Adjustable Rear sight, that strikes me as an incredibly fragile design.