When I started my current position, I was only using Google Analytics... when they told me they use Omniture, I was set to convince them they should switch.

Now that I've gotten to know Omniture (which has taken several months - its huge!) I much much prefer it.

It is so easy to set up customizable variables, tracking codes, and there are so many ready-made reports that Google just doesn't offer.

I can accomplish a lot more in a small amount of time than with Google.

Although I should say that I still use only Google Analytics for small sites. Like, less than 100 pages.

It's like comparing a new Mercedes to a 1980 Volkswagen. Depends on your needs and style. A lot depends on whether all you do with a car is drive it around the block in good weather.

Thanks all! It does make sense to use Google analytics for smaller sites and a paid analytics system for larger sites. I think I'm going to try out Omniture and post a review in a few weeks.

I was unpleasantly suprised, actually, that out of the box Omniture offers less functionality than GA. You need to request various plugins and hacks to get to the level that GA provides as is. Where omniture shines is tracking business logic applicable for your site. You can customize it to track whatever data is meaningful to your situation. As for general website performance analytics (your keywords, vistors, pageviews etc), I think GA is much easier and intuitive to use.

"Request" plugins means you get them for free from Omniture? Can that be?

Yes, you get the for free, but you have to ask for them. You can just download and install them. A minor thing, but takes 2 days for the loop to finish.