The PE90 is an assault rifle that was made for target shooting, which is why it is heavy, made largely of steel (rather than aluminum or plastic), has a bipod, sophisticated iron sights, etc. and is so much more accurate than a typical assault rifle.
As #### Horrocks (well-known TR shooter) said to me once: "The Swiss have the best-trained rifle shooters in the world and will easily be able to defeat any other Army where small arms are the deciding factor... provided they all stand exactly 300m away from the Swiss."
Which just about sums it up, IMO.
One thing no-one ever mentions about the PE90 is that they are prone to rust in a humid environment. The Swiss don't have a humid environment and I get the impression Iraq is very dry, so it's never come up, but they do rust a lot more easily than an AR-15 for example.
However, you've got to ask yourself the question as to what you intend to do with it. Are you going to be using it for target shooting or are you going to be walking through the jungle with it?
If you're using it for target shooting, there is no centrefire semi-automatic rifle to beat it out-of-the-box, with the exception of some of the high-end AR-15s and M1As, which usually cost nearly as much or more (and are usually less reliable imx, with certain exceptions).
This is not to say the PE90 is not a tough rifle, they had to redesign the stock because it was so tough it would bend the receiver if you dropped the rifle on the ground at just right angle, with the stock folded. They had to redesign it so the stock would break. But it is heavier than most of the competition, because the people who designed it had 300m ISSF in mind.