I found that carpeting is a pain in the butt to install, and I am glad that I only had to do it once! I have the BREEZE carpeting and althoug it was expensive - it is one of the more 'visible' parts of the car. It comes rough cut - so you just need to trim it up a little. The only problem that I had was that I used the 1/4" insulation on the trans tunnel and when I did the back cockpit wall, the cut was off a little because of the extra insulation.
The seems are easier to hide because it is very plush. Also, because of it's thickness, you almost have to brush it to get the dirt and debris out, a shop vacumn just doesn't want to do the job.