Kris - I have had three sets of ContiGo tires over the last three years with each set lasting at least 8,000 miles. I usually do two long rides, 2,500 miles plus, per riding season and lot's of 100 - 250 mile weekends.
One thing I read this winter (can't find the link at the moment) was that modern tires should be run at the tire manufacturer recommended rating vs. the older (1979 R65 in my case) motorcycle manufacturer rating. I now run my tires at a minimum 36 psi and up to 38 or so on the rear. (Ratings that I found on the Continental site). As expected, handling is much more crisp, but I really don't notice much added harshness in the suspension.
I just completed a 3,100, 10 day ride through the deep South in the U.S. with new ContiGo's. At this point the tires have lot's of tread left.
I can't say that they are the longest lasting tire, but perhaps the fast wear you experienced was due to the tire pressure being were too low, causing added heat and premature wear?
Randy